Thursday, September 26, 2019
Importance of Health Essay Example | Topics and Well Written Essays - 1250 words
Importance of Health - Essay Example The research paper ââ¬Å"Importance of Healthâ⬠highlights the importance of the level of health care and the ethics of nursing care in patientsââ¬â¢ treatment. The aim of nursing is to maintain well-being by prevention of injuries and avoidance of illnesses. A healthy citizenry is the primary aim of any government public health program. On the other hand, there are many resource constraints which can prevent the government from giving a much-needed help for health care to everyone of its citizens. This paper discusses the many ways by which the nursing profession can also do its part as a crucial member of the health care team. It is always a good mindset to not rely on the government in all instances, such as in health care. There are clearly limits to what the government can do, given its limited budget and also the very bureaucratic nature of governance; help may not be forthcoming at all or it might get delayed. In particular, this paper looks at how changing demographi cs has increased the number of elderly citizens in most countries today. This group of people is the most vulnerable of all, in terms of access to health care, financial resources, and the onset of many age-related ailments or diseases. Older or senior citizens therefore require special attention because of these factors. The overall aging (graying) of society is not confined to just a few countries. Advances in medical or scientific knowledge also contributed to longer lifespans, so there are now more older people. Most senior citizens are parents and grandparents, with families of their own and many offspring who love them for their warmth, wisdom, and accumulated knowledge. Their impact on the overall community is their presence gives younger people and families a certain sense of importance and continuity in terms of inter-generational relationships. The importance of them staying healthy is that the community can exert effort on more productive activities and not get tied down to caring for them and spending financial resources for their medication and treatment. To stay healthy is to save precious dollars which impacts positively on the whole community. The primary responsibility for senior group health is on the members of their own family who have to take care of them and provide for their material
Annotated Bibliography Research Paper Example | Topics and Well Written Essays - 1000 words - 1
Annotated Bibliography - Research Paper Example In the article, the author sees organizations as agent of culture in the global domain. For this reason, this article provides a first-hand understanding of culture and how managers can adapt their expansions strategies to benefit from rational global culture. Notably, this article can equip managers of organization with the necessary understanding of cultural rationalization of the global business environment. Borges, L., & Tian, K. (2011). Cross-cultural issues in marketing communications: An anthropological perspective of international business. International Journal of China Marketing, 2(1): 110-121. In this article, two college professors discuss the role of culture and its impact on communication in global business. Borges and Tian (2011) reveal that many global cultures are focused on retaining their culture rather than accepting new culture. The article further explains why this tendency can impose extra challenge on business expanding in the global front. Indeed, this explai ns why many organizations must understand how culture affects their communication process in order to tailor their messages to suit the needs of the local communities. Most importantly, the article describes how cultural values affect communication and the necessity of business to learn cultural values of foreign cultures. Boyer, M. A., & Lavalee, T. M. (2006). Globalization and local governance: Implications from Wal-Martââ¬â¢s expansion. International Studies Perspectives, 7: 254ââ¬â266. The article makes use of Wal-Mart to illustrate the effect of culture on expansion of business in new business environment. Boyer and Lavalee (2006) reveal that business which expands to global market often faces local forces that are not willing to trade their local culture. In this journal article, the authors emphasize that understanding the local culture is paramount in business expansion. Written by renowned university scholars, the article serves as an example to managers on how they can face local culture and prevent failure of business as they expand to new global frontiers. This suitable article can galvanize the ability of managers to succeed in global markets. Deleersnyder, B., Dekimpe, M. G., Steenkamp, E.M., & Leeflang, P. S. H. (2009). The role of national culture in advertisingââ¬â¢s sensitivity to business cycles: An investigation across continents. Journal of Marketing Research, 21: 623ââ¬â636. In this journal article, the author discusses the intricate relationship between advertising and culture. The authors posit that national culture can affect advertising and multination businesses must be aware of these cultural variations to adapt their advertising strategies. The article overemphasize that decisions to set advertising can affect the success of business expanding into new global markets and business must understand how culture shapes their advertising. Written with a focus on managers and their role in advertisements, this article offers new insight on advertising in the global market. Garvin, D. A. (2004). What every CEO should know about creating new businesses. Harvard Business Review, 82(7/8), 18-21. In this article, Garvin (2004) illuminates several reasons that limit the creation of business and culture is one of them. In particular, the article faults the lack of cultural awareness as one of the proxy for business
Wednesday, September 25, 2019
BHP Billitons Vacation Program Case Study Example | Topics and Well Written Essays - 500 words
BHP Billitons Vacation Program - Case Study Example Being a chemical engineer, it has always been my dream desire to associate myself with a company, which adopts highest standards of professionalism and values better performances. BHP Billiton believes in equality in all it does. The Company expresses its dedication towards growing a rich culture, diverse workforce and providing a work environment in which every employee is treated fairly, respected and has the opportunity to contribute to business success - while always being given the opportunities to realize their full potential as individuals. I am sure everybody would love to perform still better if provided such a working environment. I am no exception to this temptation and feel quite excited about the vacation program to secure a head start for my career. The resources sector is a highly growth potential sectors today as the world's demand for resources continues to increase. Therefore if provided an opportunity, I'll try my best to make optimum use of the opportunity by learning the professionalism and skills required to excel in life.
Tuesday, September 24, 2019
European economic integration results in European cultural Essay
European economic integration results in European cultural integration. Discuss - Essay Example However, there are those who suggest the cultural integration is more or less impossible since the differences between the countries which form the European Union are so vast that a cultural divide will always remain (Bruter, 2004). For example, the case of America can be presented where cultural divides still exist even when the economies of the American states are more or less perfectly integrated and the language is also the same. Despite these similarities, there are significant differences between urban and rural American cultures as well as the several subcultures living in the country. It seems that cultural and economic integration in Europe are certainly related since the EU considers the sharing of cultural values to be something that is supposed to produce better Europeans (EC, 2006). However, to say that economic cooperation would produce better cultural integration might be a little pessimistic since this statement also suggests that better cultural integration might not be as fast without having economic cooperation first (Erdogan, 2006). Secondly, it can also be said that the present natural level of cultural homogeneity might be good enough since if the Europeans totally integrate their cultures from Dusseldorf to Birmingham, the continent would certainly lose a lot of its charm (Gordon, 2004). There are also examples of situations where economic integration does not help cultural integration and in severe cases, economic integration might be seen as a negative force of globalisation which causes a backlash against the European ideal (Gordon, 2004). In Turkey for example, economic integration and strong economic connections had been established for years, yet complete integration is still far off. The Economist (2005) reported that there were significant differences and opposition levels to Turkey in Europe and to Europe in Turkey. The differences are based not only on legal
Monday, September 23, 2019
Conclusion report for the internship journey Essay
Conclusion report for the internship journey - Essay Example The major challenge was language difference, especially when interacting with customer and staff. However, I did my best to create a profitable impact and add value both to Guangdong and myself. There were both memorable and awkward situation during the two months in Guangdong but all these posed as lessons and opportunities to learn more. With the help of one of the staff, I gained confidence, customer relation skills, teamwork skills, intrapersonal and interpersonal communication skills. The main focus of my internship would be the opportunity to participate in the exhibition of Lingnan Folk Craftworks, Sparkling Flowers, and Ingenious Craftsmanship and Creativity. Sparkling flowers exhibition entailed displaying all collected works by Enamel while Craftsmanship and Creativity involved works by Canton Embroiidery. Exhibiting Lingnan Folk Craftworks expounded more on the culture and traditions of chines. I came to learn of their unique art, painting and paper cutting skills, as well as, their cultural believes. Lastly, I also came to learn of the Guangzhou residential furnishings with keen reference to the furniture tracing back to Ming and Qing dynasties. However, designs for furniture have changed and the old have been replaced with better designs or refurnished to be better. It was clear that the preferences and designs of people change with emerging
Sunday, September 22, 2019
Lack of Connection between Educational Research and Practice Essay Example for Free
Lack of Connection between Educational Research and Practice Essay Educational research is conducted on the premise that an expansion of knowledge in the area of classroom teaching should automatically lead to improvements in the classroom, not only with respect to teaching styles but also the academic progress of students. All the same, this enhancement of knowledge is not always welcomed by teachers (Kennedy, The Connection). According to Mary M.à Kennedy, the author of ââ¬Å"The Connection between Research and Practice,â⬠teachers may fail to apply new knowledge based on research for the following reasons: (1) The research is not authoritative or convincing enough to move teachers to alter their practices; (2) The teachers find it difficult to directly apply the new knowledge because they consider it irrelevant to their particular concerns or questions on the subject of teaching; (3) The research findings may not have been communicated in an understandable way; and (4) It is impossible for the educational system to accept the changes entailed by new research-based knowledge (Kennedy, The Connection). G.à Reid Lyon, the Chief of the Child Development and Behavior Branch of the National Institute of Child Health and Human Development, U. S. Department of Health and Human Services, expresses dismay at the lack of connection between educational research and practice: Scientific research can inform beginning reading instruction. We know from research that reading is a language-based activity. Reading does not develop naturally, and for many children, specific decoding, word recognition, and reading comprehension skills must be taught directly and systematically. We have also learned that preschool children benefit significantly from being read to. The evidence suggests strongly that educators can foster reading development by providing kindergarten children with instruction that develops print concepts, familiarity with the purposes of reading and writing, age-appropriate vocabulary and language comprehension skills, and familiarity with the language structure. â⬠¦One hopes that scientific research informs beginning reading instruction, but it is not always so. Unfortunately, many teachers and administrators who could benefit from research to guide reading instructional practices do not yet trust the idea that research can inform their teaching (Lyon). The lack of connection between educational research and practice astounds many researchers. Even so, this lack of connection is sometimes approved by researchers. In the case of reading, for example, there are researchers who perceive that theories are ââ¬Å"neither practical nor profitableâ⬠given that reading is ââ¬Å"a complex phenomenon (Calfee and Drum 183). â⬠These researchers even assume that ââ¬Å"theoretical analysis is unnecessary, if not impossibleâ⬠in this area (Calfee and Drum 183). Thus, there appears confusion with regards to applying educational research in the classroom. Seeing that the educational researchers do not always agree amongst themselves, it is unsurprising that teachers find it hard to understand new research-based knowledge before they can apply it. Teachers may not only disagree with educational researchers, but they also disagree with education reformers that base their ideals on current educational research after sifting through the disagreements among researchers (Kennedy, Reform Ideals). Research suggests that the teaching practice is strongly influenced by the values of the teachers themselves (Aguirre and Speer; Brickhouse). In other words, teachers may simply disagree with educational research that blatantly conflicts with their beliefs about their practice. According to Argyris and Schon, such is the difference between ââ¬Å"espoused theoriesâ⬠and ââ¬Å"theories in use. â⬠Despite the advice of researchers as well as reformers, teachers may simply find it impossible to apply educational research in the classroom when their own beliefs conflict with the ideals of others. Kennedy has experienced the conflict between teacher practice and expectations while teaching in a different culture. Working in Thailand, without immediately appreciating the practice of teaching expected in the new culture, she was rather confused about the method of teaching that she was expected to adopt. She believed that she was right in her teaching style; however, the expectations of the Thai school administrators and students differed. ââ¬Å"It took me a long time to adjust my practice to accommodate their expectations,â⬠she wrote later (Kennedy, Learning to Teach). Of course, if she had failed to adjust, she would have found it difficult to succeed in the new culture as a teacher. Educational research is meant to influence teacher practice (Kennedy, Means and Ends). Nevertheless, resistance to change is a reality that must be confronted by all organizations, whether they are academic in nature or purely for profit. Teachers may believe that a certain educational finding is irrelevant to their concerns or questions about teaching. Still, the real reason why teachers do not always apply current educational research in the classroom is that they believe that their own practices are correct at any given time. In spite of Kennedyââ¬â¢s focus on the connection between educational research and practice, it took her a ââ¬Å"long time to adjustâ⬠to a new culture of schooling. Given that educational research is growing by leaps and bounds nowadays, it is but natural for other teachers also to take a long time to adjust to new knowledge in the classroom. Change may sometimes be imposed upon the teachers, as in the case of new technologies that must be adopted in our times in a large number of schools around the globe (Bell, Codde and Bell). When change is not imposed upon the teachers, it is difficult for them to decide on the kinds of changes to adopt and disregard. According to a website on education: Educational research is potentially a great resource for supporting learner-centered practices, but there is a disjuncture between the worlds of the educational researcher and the practitioner (whether faculty member, instructional technologist, or learning designer). A few ears ago at the International Conference on Learning Sciences held in Ann Arbor, keynote speaker Linda Roberts commented on a 500+ page proceeding, saying This is fabulous, relevant, and meaningful work the only problem is: no one who needs it is going to read it. That is, there is not much of a bridge between research and practice (ââ¬Å"Bridging Teaching and Learning Research and Practiceâ⬠). Educational research has consistently focused on student-centered practices. Nonetheless, the constantly growing amount of research is expected to bewilder teachers about the appropriate teaching styles to adopt at any given time. The adoption of new technologies was considered necessary change. In cases where change is not considered urgent, however, there is bound to remain a wide gap between educational research and teacher practice. As mentioned previously, even educational researchers disagree about the kinds of changes that must be considered relevant or irrelevant. Hence, teachers are left with no choice but to take ââ¬Å"a long time to adjust. â⬠Teachers may additionally choose not to adjust to new knowledge. This is because the teacherââ¬â¢s values are imperative in the classroom. His or her belief system may not concede to a certain change in teaching style. Besides, change is often very difficult to adjust to. Hence, the lack of connection between educational research and practice is unavoidable in reality.
Saturday, September 21, 2019
Effect of Zn Concentration on NiZnFe2O4 Nanoparticles
Effect of Zn Concentration on NiZnFe2O4 Nanoparticles CHAPTER-7 EFFECT OF Zn CONCENTRATION ON MAGNETIC AND DIELECTRIC PROPERTIES OF NiZnFe2O4 NANOPARTICLES 7.1 INTRODUCTION Ni (1-x) Zn (x) Fe2O4 (x=0.2, 0.4 and 0.6) nanoparticles are synthesized by using coprecipitation method. Zinc is a known metal, its role is important in the modification of ferrite properties by redistribution over the tetrahedral and octahedral sites of the spinel lattice. Rath et al (2002) reported the effect of zinc substitution on lattice parameter and magnetic properties on Mn-Zn ferrites prepared by hydrothermal precipitation method. Arulmurugan et al (2005) studied the effect of zinc substitution on Co-Zn and Mn-Zn ferrite nanoparticles prepared by coprecipitaion method. This chapter discusses the effect of zinc concentration on structural, magnetic and dielectric properties of NiZnFe2O4 nanoparticles prepared by co-precipitation method. The detailed experimental procedure involved in the preparation of NiZn ferrite nanoparticles has been already reported in chapter IV. In this method three different compositions such as x=0.2, x=0.4 and x=0.6 were used in the chemical formula Ni (1-x) Zn(x) Fe2O4 to analyze the properties of the ferrite nanoparticles. 7.2 RESULTS AND DISCUSSION 7.2.1 X-ray Diffraction (XRD) analysis The average crystallite size ââ¬Ëtââ¬â¢ and the lattice parameter ââ¬Ëaââ¬â¢ were calculated from X-ray diffraction data as reported in the chapter ââ¬âIV. The values of particle size and Lattice parameter of all samples are also tabulated in Tables 7.1, 7.2 and 7.3. The particle size decreased from 24 to 12nm with the increase of Zn concentration. The same behavior of decrease in particle size with the increase of zinc concentration was also observed for the samples sintered at 600à °C and 900à °C. The decrease in particle size due to the increase of zinc concentration was 26 to 20nm for sintered sample at 600à °C and 31 to 25 nm for sintered sample at 900à °C respectively. This variation of particle size with zinc concentration at the above mentioned sintering temperature of Ni Zn ferrites nano particles is shown in Fig.7.1. The above observation shows that the presence of zinc blocks the grain growth. The surface temperature affects the molecular concentration at the surface of the crystal, and hence, the crystal growth (Upadhyay et at 2004). The formation of Zn-ferrite is more exothermic as compared with the formation of Ni-ferrite (Navrotsky Kleppa 1968). Thus, the crystal surface temperature increases with addition of zinc, decreasing the molecular concentration at the crystal surface and hence, obstructing the grain growth. The effects of zinc concentration on structural, magnetic and dielectric properties of Ni-Zn ferrite nano particles were studied. Particle size decreased with the increase of concentration. This decreasing in particle size behavior was observed for all the categories of concentration variation at different sintering temperature levels. The effect of zinc concentration on particle size showed a reverse effect compared with the effect of sintering temperature (chapter-IV), in which the particle sizes increased with the increase of sintering temperature. Table 7.1Particle size and Lattice parameter of as prepared Ni (1-x) Zn (x) Fe2O4 (x= 0.2, 0.4 and 0.6) nano particles Table 7.2 Particle size and Lattice parameter of Ni (1-x) Zn (x) Fe2O4 (x= 0.2, 0.4 and 0.6) nano particles sintered at 600à °C Table 7.3 Particle size and Lattice parameter of Ni (1-x) Zn (x) Fe2O4 (x= 0.2, 0.4 and 0.6) nano particles sintered at 900à °C From Tables 7.1, 7.2 and 7.3 it is also observed that the lattice parameter increases with the increase of zinc concentration. The lattice parameter value for as prepared are increased from 8.33 to 8.37Ã⦠with the increase of zinc. For the samples sintered at 600à °C the lattice parameter value for lower zinc concentration (x=0.2) is 8.63Ã⦠and higher zinc concentration (x=0.6) is 8.66 Ãâ¦. The similar behavior of increase in lattice parameter with zinc concentration is also observed as 8.64 to 8.68 Ã⦠in the samples sintered at 900à °C. This increase of lattice parameter with zinc concentration for all sintering temperatures of Ni Zn ferrites nano particles are also shown in Fig.7.2. The addition of Zn2+ in Ni-ferrite causes the Fe3+ ions to migrate from A site to B site. The larger ionic radius of zinc (0.82Ãâ¦), compared with ferric ion (0.67 Ãâ¦), makes the A site and thus the lattice expands, increasing the lattice parameter. A similar variation of particle size and lattice parameter with zinc content had been observed by Joshi Kulkarrni (1986) for Mg-Zn Ferrite. Fig.7.1Variation of particle size with zinc concentration for all sintering temperatures Fig.7.2Variation of lattice parameter with zinc concentration for all sintering temperature 7.2.2 Magnetic Properties The room temperature B-H hysteresis loops of Ni (1-x) Zn (x) Fe2 O4 nano particles for different zinc concentration (x = 0.2, 0.4 and 0.6) sintered at 600à °C and 900à °C are shown in Figs.7.3 (a), 7.3 (b) and 7.3 (c). The variations of magnetic properties such as saturation magnetization (Ms), and coercivity (Hc) for different zinc concentrations (x = 0.2, 0.4 and 0.6) at particular sintering temperature were calculated from the hysteresis data and tabulated in Tables 7.4, 7.5 and 7.6. Table 7.4 Saturation magnetization and coercivity values of as prepared Ni (1-x) Zn (x) Fe2O4 (x= 0.2, 0.4 and 0.6) nano particles Table 7.5 Saturation magnetization and coercivity values of Ni (1-x) Zn (x) Fe2O4 (x= 0.2, 0.4 and 0.6) nano particles sintered at 600à °C Table 7.6 Saturation magnetization and coercivity values of Ni (1-x) Zn (x) Fe2O4 (x= 0.2, 0.4 and 0.6) nano particles sintered at 900à °C The effect of zinc concentration on magnetic properties such as saturation magnetization and coercivity of all compositions of Ni Zn ferrite nano particles sintered at 600à °C and 900à °C are shown in Figs.7.4 and 7.5. The Fig.7.4 reveals that the saturation magnetization (Ms) decreases with the increase of zinc concentration. The saturation magnetization value decreased from 29.73 to 6.98 emu/g with the increase of zinc concentration for as prepared samples. The saturation magnetization value for the 600à °C sintered samples at lower zinc concentration (x=0.2) was 32.78 emu/g and higher zinc concentration (x=0.6) was 25.80 emu/g. A similar behavior of decrease in saturation magnetization with zinc concentration was also observed in the samples sintered at 900à °C as 64.34 to 39.50 emu/g. Fig.7.3 Hysteresis loops of Ni (1-x) Zn (x) Fe2 O4 nano particles for different zinc concentration (x = 0.2, 0.4 and 0.6) (a) as prepared (b) 600à °C sintered (c) 900à °C sintered samples This decreasing of saturation magnetization with the increase of non magnetic Zn concentration is due to the interaction created by the zinc in the tetrahedral and octahedral sites. This shows the weakening of A-B interaction, whereas B-B interaction changes from ferromagnetic to antiferromagnetic state. The occurrence of minor decrease in saturation magnetization is also evidenced from the dielectric study, because it shows that there is a minor increase in dielectric constant. This reason leads to the conclusion that saturation magnetization variation with respect to concentration for 600à °C and 900à °C samples did not cause a rapid decrease in saturation magnetization like as prepared sample. Fig.7.5 shows that the coercivity values of NiZn ferrite nanoparticles decrease with the increase of zinc concentration. The coercivity values of as prepared nanoparticles decrease from 324.36 to 306.56 Gauss. Similarly the variation of coercivity values of nanocrystalline NiZn ferrite particles with increase of Zn concentration sintered at 600à °C and 900à °C are in the range of 347.31- 340.72 Gauss and 386.67-351.34 Gauss. This is due to the decreases of magneto crystalline anisotropy constant. The magneto crystalline anisotropy constant is negative for both Ni and Zn ferrites. The absolute value of magneto crystalline anisotropy constant larger for Ni ferrites than that of Zn ferrites (Verma et al 2000). The total anisotropy is equal to the sum of their individual anisotropy. So magneto crystalline anisotropy constant and hence coercivity decreases with the increase in Zn concentration. Also reasons behind the decrease in saturation magnetization and decrease in coercivity are c learly identified from the formation of smaller particle size even at the higher Zn concentration at all sintering temperatures. Fig.7.4 Variation of saturation magnetization with zinc concentration Fig.7.5 Variation of coercivity with zinc concentration 7.2.3 Dielectric properties The effect of zinc concentration on dielectric constant of all samples of Ni (1-x) Zn (x) Fe2 O4 nano particles are shown in Figs.7.6 (a), 7.6 (b) and 7.6 (c). The values of dielectric constant and dielectric loss are tabulated in Tables 7.7, 7.8 and 7.9. Fig.7.6 Dielectric constant curves of Ni (1-x) Zn (x) Fe2 O4 nano particles for different zinc concentration (x = 0.2, 0.4 and 0.6) (a) as prepared (b) 600à °C sintered (c) 900à °C sintered samples Fig. 7.7 Dielectric loss curves of Ni (1-x) Zn (x) Fe2 O4 nano particles for different zinc concentration (x = 0.2, 0.4 and 0.6) (a) as prepared (b) 600à °C sintered (c) 900à °C sintered samples The dielectric constant attained for zinc concentration x =0.6 led to a higher value for all the samples. The variations of dielectric constant with zinc concentration for all samples are also shown in Fig. 7.8. For all as prepared samples, the dielectric constant value increased from 10.92 to 25.08 with the increase of zinc concentration. The dielectric constant value for the samples sintered at 600à °C in lower zinc concentration (x=0.2) was 15.33 and it increased to 32.86 at higher zinc concentration (x=0.6). A similar behavior of increase in dielectric constant with increase in zinc concentration was also observed in the samples sintered at 900à °C as 19.37 to 48.18. Table 7.7 Dielectric constant and Dielectric loss values as prepared Ni (1-x) Zn (x) Fe2O4 (x= 0.2, 0.4 and 0.6) nano particles Table 7.8 Dielectric constant and Dielectric loss values ofà Ni (1-x) Zn (x) Fe2O4 (x= 0.2, 0.4 and 0.6) nano particlesà sintered at 600à °C Table 7.9 Dielectric constant and Dielectric loss values ofà Ni (1-x) Zn (x) Fe2O4 (x= 0.2, 0.4 and 0.6) nano particlesà sintered at 900à °C Figs.7.7 (a), 7.7 (b) and 7.3 (c) show the effect on zinc concentration on dielectric loss factor of all samples of Ni (1-x) Zn (x) Fe2 O4 nano particles. The variation of dielectric loss factor value with zinc concentration for all sintering temperatures is also shown in Fig. 7.9. For all as prepared samples the dielectric loss factor value increased from 0.59 to 1.36 with the increase of zinc concentration. For the samples sintered at 600à °C the dielectric loss factor value for lower zinc concentration (x=0.2) was 0.68 and at higher zinc concentration (x=0.6) it was 1.61. A similar behavior of increase in dielectric loss with increase in zinc concentration was also observed in the samples sintered at 900à °C as 1.34 to 2.14. In Ni-Zn ferrites Zn occupies [A] site and Ni occupies [B]site, while Fe occupies both [A] and [B] sites. When Zn2+ is added in the place of Ni2+, with increase in Zn composition x, some of the Fe3+ ions get converted into Fe2+ ions. This increases the hopping between Fe3+ and Fe2+ ions, thereby decreasing the resistance of the grain. This increases the probability of electrons reaching the grain boundary. Hence the polarization and the dielectric constant increase. Fig.7.8 Variation of dielectric constant with zinc concentration Fig.7.9 Variation of dielectric loss with zinc concentration 7.3 CONCLUSION The effects of zinc concentration on structural, magnetic and dielectric properties of Ni-Zn ferrite nano particles were studied. The increase in zinc concentration obstructed the grain growth and decreased the particles size. The larger ionic radius of Zn, increased the lattice parameter values of NiZn ferrite nanoparticles with the increase of its concentration. The non magnetic property of zinc, decreased the saturation magnetization and coercivity values of NiZn ferrite nanoparticles. The dielectric constant and dielectric loss factor values also increased with the increase of zinc concentration due to the increase of probability of electrons reaching the grain boundary. Low value of particle size obtained at higher zinc concentration in the present work indicated that NiZn ferrite nano particles in lower nanometer scale could be obtained at higher zinc concentration.
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