P. B. Shetty, K. I. Maddani, K. S. Mahalaxmi, Ch Sanyasa Lakshmi
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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.
掺 La 的镍基铁氧体（NiFe2O4）呈现单相立方尖晶石结构。ε′在低频范围（100 KHz 以下）迅速下降，在高频范围（> 100 KHZ）缓慢下降。Tanẟ 值为 10-2 量级。Tanẟ 和 D 中 ac 值的变化与电导率有关。科尔-科尔曲线图描绘了一个半圆。这表明晶界产生了电阻。从 Z′ vs. Z″（科尔-科尔图）图中得到的电阻、电容和弛豫时间的变化是由于跳变机制造成的。
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