• S. S. Kammar

Nanocrystalline materials shows significantly different properties than that of their bulk counterpart. Strain mechanism and cation distribution plays an important role for the further decreases of particle size at nanoscale dimension. In the present study we have synthesized the nanocrystalline ferrite powders of Dy3+ substituted Ni-Zn spinel ferrites by using sol-gel auto-ignition process. Formation of single phase cubic spinal structure and phase purity were confirmed by the analysis of X-ray diffraction data. Lattice constant obtained from Nelson – Relay (N-R) function is observed increasing from 8.3730 to 8.3751 Å with Dy3+ substitution. The crystallite size obtained from Scherrer equation was confirmed by using Williamson – Hall (W-H) and Size-Strain plot (SSP) methods. Both W-H and SSP methods indicates the comprehensive type strain induced in the crystal lattice. The strain induced in the crystal lattice decreases with the increasing percentage of Dy3+ ions. Cation distribution data suggest that the larger Dy3+ ions replace smaller Fe3+ ions at octahedral – B sites. Ni2+ ions occupy octahedral – B site while as Zn2+ ions occupy tetrahedral – A site. Incorporation of higher magnetic ion Dy3+ in Ni-Zn crystal lattice increases the saturation magnetization from 71.87 to 91.54 emu/gm and decreases the coercivity from 748 to 601 Oe.

W-H analysis, SSP method, cation distribution, saturation magnetization.

"Microstructural analysis and investigations on surface morphology and impact of Dy3+ substitution on the magnetic properties of Ni-Zn ferrites. ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.99-107, May-2019, Available :http://www.jetir.org/papers/JETIR1905Y16.pdf

"Microstructural analysis and investigations on surface morphology and impact of Dy3+ substitution on the magnetic properties of Ni-Zn ferrites. ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp99-107, May-2019, Available at : http://www.jetir.org/papers/JETIR1905Y16.pdf