Author:
,Shetty P. B.,Maddani K. I., ,Mahalaxmi K. S., ,Lakshmi Ch. S.,
Abstract
La-doped Ni-based ferrites (NiFe2O4) exhibit a single-phased cubic spinel structure. ε′ exhibits a quick decline in the low-frequency regime (upto 100 KHz) and a sluggish reduction in the high-frequency range (> 100 KHZ). Tanẟ values are found to be of the order of 10-2 . Variation in Tanẟ and ac values in D relates to conductivity. Cole-Cole plots portray a single semicircle. This points towards the contribution of resistance induced by grain boundaries. The variations in resistance, capacitance, and relaxation time obtained from Z′ vs. Z″ (Cole Cole graph) plots are due to the hopping mechanism.
Publisher
Virtual Company of Physics