Journal
JOURNAL OF APPLIED PHYSICS
Volume 116, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4896945
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Funding
- NSF
- NSF-PREM Grant [DMR-1205302]
- National Science Foundation [NSF DMR 0521650]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1205302] Funding Source: National Science Foundation
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Gadolinium (Gd) substituted cobalt ferrites (CoFe2-xGdxO4, referred to CFGO) with variable Gd content (x = 0.0-0.4) have been synthesized by solid state ceramic method. The crystal structure and impedance properties of CFGO compounds have been evaluated. X-ray diffraction measurements indicate that CFGO crystallize in the inverse spinel phase. The CFGO compounds exhibit lattice expansion due to substitution of larger Gd ions into the crystal lattice. Impedance spectroscopy analysis was performed under a wide range of frequency (f = 20 Hz-1 MHz) and temperature (T = 303-573 K). Electrical properties of Gd incorporated Co ferrite ceramics are enhanced compared to pure CoFe2O4 due to the lattice distortion. Impedance spectroscopic analysis illustrates the variation of bulk grain and grain-boundary contributions towards the electrical resistance and capacitance of CFGO materials with temperature. A two-layer heterogeneous model consisting of moderately conducting grain interior (ferrite-phase) regions separated by insulating grain boundaries (resistive-phase) accurately account for the observed temperature and frequency dependent electrical characteristic of CFGO ceramics. (C) 2014 AIP Publishing LLC.
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