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- Title
Effect of cation distribution on the structural and dielectric properties of Ni0.5-xCoxZn0.5Fe2O4 (0.0 ≤ x ≤ 0.5) ferrites.
- Authors
Atif, M.; Rafique, T.; Rehman, Atta Ur; Wahab, H.; Khalid, W.; Ali, Z.; Nadeem, M.
- Abstract
Cobalt-substituted nickel–zinc ferrite nanoparticles, i.e., N i 0.5 - x C o x Z n 0.5 F e 2 O 4 (0.0 ≤ x ≤ 0.5) were prepared by the sol–gel method. X-ray diffraction patterns revealed that the prepared samples crystallized in cubic spinel structure, whereas the scanning electron microscopy study exhibited a change in the morphology of grains due to Co2+ substitution. 57Fe Mössbauer measurements suggested that the presence of iron is only in the Fe3+ oxidation state which is randomly distributed over the tetrahedral and octahedral sites. However, the fraction of Fe3+ ions present at the octahedral site strongly depends on the unusual site preference of substituted Co2+ ions for the tetrahedral site. Thus, the cationic distribution between both the sites altered with increasing Co2+ substitution. Significant enhancement in the resistive properties is found with increasing Co2+ substitution and the obtained values are ~ 104 times higher than that reported for their bulk counterparts. This improvement in the resistive properties is elucidated based on changes in the microstructure and cation redistributions due to Co2+ substitution. Here, we report that the colossal resistivity (3.82 × 1010 Ω cm) and diminished tangent loss (~ 0.01) for the sample with x = 0.2 make this composition interesting for high-frequency applications.
- Publication
Journal of Materials Science: Materials in Electronics, 2020, Vol 31, Issue 14, p10970
- ISSN
0957-4522
- Publication type
Academic Journal
- DOI
10.1007/s10854-020-03645-8