A.c. susceptibility study of CaCl2 doped copper�?�zinc ferrite system

[摘要] Polycrystalline soft ferrites, Zn$_x$ Cu$_{1â€�?�x}$ Fe₂O₄ (ð‘�? = 0.30, 0.50, 0.70, 0.80 and 0.90), doped with controlled amount of calcium chloride (CaCl₂) were prepared by standard ceramic route and studied for a.c. susceptibility. X-ray diffraction studies of the compositions reveal formation of single-phase cubic spinel. The values of lattice constant increase as doping percentage of CaCl₂ increased from 0.01% to 0.05% and afterwards decrease slightly. The presence of chlorine ions is confirmed by absorption peak in far IR spectra near 650 cm^-1 for all the samples. The variation of a.c. susceptibility with temperature shows the existence of single domain structure for ð‘�? = 0.3 and exhibits transition from single domain to multidomain structure with increased Ca²⁺ contents from 0.01 to 0.1%. The composition, ð‘�? = 0.5, shows multidomain structure independent of Ca²⁺ content. The samples for ð‘�? = 0.70, 0.80 and 0.90 show paramagnetic behaviour at and above room temperature.

[学科分类] 材料工程

[关键词] Polycrystalline ferrites;a.c. susceptibility;Curie temperature;magnetic properties with CaCl2 doping;effect of additives.