X-ray, SEM, far IR characterization and bulk magnetic properties of Zn²⁺ substituted copper ferrite synthesized by co- precipitation technique

Abstract

The alternating current (ac) low field susceptibility vs temperature and magnetization measurements are reported for the spinel solid solution series Zn_xCu_1-xFe₂O₄ <i>(x </i>= 0.0, 0.2, 0.4, 0.5, 0.6, 0.8) synthesized by a wet-chemical method before and after high temperature annealing. The low values of lattice constant, magneton number and Neel temperature for wet-samples (W) as

<span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">compared to annealed wet (A W) <span style="font-size:14.0pt;line-height:115%;font-family: " times="" new="" roman";mso-fareast-font-family:hiddenhorzocr;color:black;mso-ansi-language:="" en-in;mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">samples <span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">are explained on the basis of fine particle nature of wet samples. The high temperature annealing changes the wet-prepared ferrites into ordered magnetic structure of ceramic ferrites. The Neel temperature calculated theoretically are in good agreement to those deduced experimentally. Scanning electron micrographs are used to see the grain growth and homogeneity of the samples while infra red spectra are used to determine water and sulphate content and to confirm ordered spinel ferrite structure.</span></span></span>