Effect of Frequency of the Alternating Electric Field on Temperature Impedance Spectra of LuFe2O4 Ceramic Multiferroic

摘要

Temperature impedance spectra are measured on LuFe2O4 ceramic multiferroics over a temperature range of 100-400 K, upon applying a sinusoidal voltage with a frequency varying between 20 Hz and 120MHz. At signal frequencies of 30-70 MHz, spectra exhibit features such as an abnormal positive temperature resistance coefficient within the temperature range of 200-260 K, which are interpreted in the context of the generalized barrier model.