Electrical Properties of Cadmium Substitution in Nickel Ferrites

• 作者: Ande Ashok Chandiri Sudhakar Reddy Chinnala Venkateshwarlu Dachepalli Ravinder Kappera Nageshwar Rao Meesala Prasad Thatikonda Somaiah
• 来源期刊: 凝固态物理国际期刊(英文)
• 学科: 化学
• 关键词: Ni-Cd FERRITE THERMO Electric Power SEEBECK Coefficient Charge CARRIER Concentration ELECTRICAL Conductivity
• 年，卷（期）: ngtwlgjqkyw_2012,（4）
• 页码范围: 257-266
• 页数: 10页
• 分类号: O6

摘要

Electrical transport properties such as conductivity (σ) and thermo electric power (S) of Cadmium substituted Nickel Ferrites, forming chemical formula Ni1–xCdxFe2O4, where x = 0.0, 0.2, 0.4 have been investigated from room temperature to well beyond the Curie temperature. Plots of log (σT) versus 103/T are linear and show a transition near the Curie temperature. The transition temperature is found to decrease with increase of Cd content. On the basis of Seebeck coefficient (S), the ferrites under investigation have been classified as n-type and p-type semiconductors. The values of charge carrier concentration and mobility have been computed from experimental values of Seebeck coefficient and electrical conductivity. The activation energy in the ferrimagnetic region is in general less than that in the paramagnetic region. An attempt is made to explain the conduction mechanism in these ferrites.