摘要
The dielectric permittivities(ε′ & ε″) and dielectric loss tangent(tan) are studied for the prepared samples CuFe2O4 and Cu1-xZnxGa0.1Fe1.9O4 spinel ferrites with(0.0 ≤ x ≤ 0.5) from room temperature up to 700K in the frequency range(102~105Hz).Dielectric anomaly at the transition temperature Tc is pronounced in the relations of dielectric permittivitties with temperature where,the obtained Tc is found to decrease linearly with increasing Zn concentration.The relation of tan with frequency at different temperatures shows relaxation spectra where the relaxation time and the maximum frequency of the hopping conduction mechanism are determined.The variation of(ε′,ε″ and tanδ) with frequency and temperature displays a strong dependence on both gallium and zinc concentrations.The results are explained in light of the cation-anion-cation and cation-cation interactions over the octahedral sites in the spinel structure.
The dielectric permittivities（ε′ ε″） and dielectric loss tangent（tan） are studied for the prepared samples CuFe2O4 and Cu1-xZnxGa0.1Fe1.9O4 spinel ferrites with（0.0 ≤ x ≤ 0.5） from room temperature up to 700K in the frequency range（102-105Hz）.Dielectric anomaly at the transition temperature Tc is pronounced in the relations of dielectric permittivitties with temperature where,the obtained Tc is found to decrease linearly with increasing Zn concentration.The relation of tan with frequency at different temperatures shows relaxation spectra where the relaxation time and the maximum frequency of the hopping conduction mechanism are determined.The variation of（ε′,ε″ and tanδ） with frequency and temperature displays a strong dependence on both gallium and zinc concentrations.The results are explained in light of the cation-anion-cation and cation-cation interactions over the octahedral sites in the spinel structure.
出处
《沈阳理工大学学报》
CAS
2010年第2期86-91,共6页
Journal of Shenyang Ligong University
关键词
电介质介电常数
温度
锌
频率
dielectric parameters
hopping mechanism
cation-anion-cation and cation-cation interactions.
