(2006). Temperature, Frequency and Composition Dependence of Dielectric Properties of Nb Substituted Li-ferrites. test, 29(1), 131-140. doi: 10.21608/ejs.2006.149148
. "Temperature, Frequency and Composition Dependence of Dielectric Properties of Nb Substituted Li-ferrites". test, 29, 1, 2006, 131-140. doi: 10.21608/ejs.2006.149148
(2006). 'Temperature, Frequency and Composition Dependence of Dielectric Properties of Nb Substituted Li-ferrites', test, 29(1), pp. 131-140. doi: 10.21608/ejs.2006.149148
Temperature, Frequency and Composition Dependence of Dielectric Properties of Nb Substituted Li-ferrites. test, 2006; 29(1): 131-140. doi: 10.21608/ejs.2006.149148

Temperature, Frequency and Composition Dependence of Dielectric Properties of Nb Substituted Li-ferrites

Egyptian Journal of Solids
Article 8, Volume 29, Issue 1, 2006, Pages 131-140    PDF (292.06 K)
DOI: 10.21608/ejs.2006.149148
Abstract
Samples having the chemical formula Li0.5+xNbx Fe2.5-2x O4 (0 ≤ x ≤ 0.20)
were prepared by the standard ceramic method. The real part of the dielectric
constant έ and the ac conductivity σac are measured at different frequencies
from 50-105 Hz and in the temperature range (300-700 K) and then the
dielectric loss tangent tan δ was calculated. The sample with x=0.2 showed the
lowest values of σac and έ, at any given temperature, as compared with the other
samples. Moreover, έ and σac showed an increase with temperature for all
samples while tan δ (T) showed a maximum around 600 K. έ and σac are
decreased with frequency without relaxation. The effect of Nb concentration on
the dielectric parameters is discussed according to the two layer model.
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