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Author Kumar, Rajeev ♦ Mall, Ashish Kumar ♦ Gupta, Rajeev
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ ACTIVATION ENERGY ♦ CERAMICS ♦ DIELECTRIC MATERIALS ♦ FERRITES ♦ GALLIUM COMPOUNDS ♦ GRAIN BOUNDARIES ♦ IMPEDANCE ♦ LATTICE PARAMETERS ♦ PERMITTIVITY ♦ PEROVSKITE ♦ PHASE TRANSFORMATIONS ♦ POLYCRYSTALS ♦ RELAXATION ♦ SOL-GEL PROCESS ♦ SPECTRA ♦ SYMMETRY ♦ TEMPERATURE DEPENDENCE ♦ X RADIATION ♦ X-RAY DIFFRACTION
Abstract Polycrystalline GaFeO{sub 3} (GFO) samples were synthesized by sol-gel method. The structural and dielectric properties of GaFeO{sub 3} ceramic have been investigated by a combination of XRD and permittivity measurement. The X-ray diffraction spectra shows single phase orthorhombically distorted perovskite structure with Pc2{sub 1}n symmetry over a wide range of temperature 300 K to 600 K, with no evidence of any phase transition. Refined lattice parameters (a, b, c and V) increases with increasing temperature. Temperature dependent dielectric properties were investigated in the frequency range from 100Hz–5MHz. Impedance spectroscopy study on the sample showed that the dielectric constant and ac conductivity with frequency increases on increasing the temperature. Cole-Cole plots suggest that the response from grain is dominant at low temperature whereas grain boundary response overcomes as temperature increases. The relaxation activation energy (calculated from Cole-Cole plots) value is found to be 0.32 eV for the grain boundary. We believe that the oxygen ion vacancies play an important role in conduction processes at higher temperatures.
ISSN 0094243X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-05-06
Publisher Place United States
Volume Number 1728
Issue Number 1


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