X-ray and magnetic studies of Zn2+ substituted Ni�?�Pb ferrites

[摘要] Seven samples of the polycrystalline, Ni_{1.25â€�?�ð�?��?}Zn_ð‘�?Pb_0.25Fe_1.5O₄ (ð‘�? = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6) ferrites, were prepared by usual double sintering ceramic method. X-ray diffraction patterns of the samples revealed single-phase cubic spinel structure. The magnetic properties were investigated by means of magnetization and a.c. susceptibility (ðœ�?) measurements. A.C. susceptibility was measured from room temperature to the Curie temperature (ð‘�??_C) of the samples. Variation of a.c. susceptibility (ðœ�?) with temperature showed that the samples with ð‘�? = 0.3 and 0.5 contain single-domain (SD) particles whereas the samples with ð‘�? = 0.4 and 0.6 showed multi-domain (MD) nature. Values of Curie temperature (ð‘�??_C) as obtained from the study of variation of a.c. susceptibility with temperature were found to decrease with increase in the Zn²⁺ concentration (ð‘�?). Magnetic measurements showed increase in magnetization as Zn²⁺ content was increased from 0.0 to 0.5. Further increase in Zn²⁺ content (ð‘�?) reduces the magnetization.

[学科分类] 材料工程

[关键词] Mixed ferrites;a.c. susceptibility;cation distribution;magnetization.