Temperature, Frequency and Composition Dependence of Dielectric Properties of Nb Substituted Li-ferrites | ||||
| Egyptian Journal of Solids | ||||
| Article 8, Volume 29, Issue 1, 2006, Page 131-140 PDF (292.06 K) | ||||
| DOI: 10.21608/ejs.2006.149148 | ||||
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| 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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