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Enhanced dielectric property of Ni ferrite by Sm and Ho substitution
Date Issued
20-09-2010
Author(s)
Abstract
The enhancement in the dielectric constant of NiO Fe1.925 Sm0.075 O3 and NiO Fe1.925 Ho0.075 O3 when compared to pure NiO Fe2 O3 is reported. Sm- and Ho-substituted Ni ferrites crystallize in the cubic inverse spinel phase. Frequency variation in the dielectric constant shows the dispersion that can be modeled with a modified Debye's function, which considers the possibility of more than one ion, contributing to the relaxation. Temperature-dependent electrical conductivity curves exhibit two distinct regions indicative of two different types of conduction mechanisms, the small polaron and variable range hopping, at 220-300 and 160-220 K regions, respectively. © 2010 The Electrochemical Society.
Volume
13