Transport mechanism in a ceramic system: LiCo3/5Fe1/5Cu1/5VO4 |
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Authors: | Moti Ram |
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Affiliation: | Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur, West Bengal, 721302, India |
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Abstract: | The electrical impedance and modulus properties of a LiCo3/5Fe1/5Cu1/5VO4 ceramic system were measured by impedance spectroscopy method in the frequency range 102-106 Hz and temperature range 22-250 °C. X-ray diffraction study reveals formation of the compound in a cubic crystal system with lattice parameters a = 8.2756 (3) Å. Field emission scanning electron microscopy is used to investigate the grain morphology of the material. Nyquist plots confirm the existence of bulk and grain boundary effects at 22 °C ≤ T ≤ 200 °C, and bulk, grain boundary and polarization effects at T ≥ 225 °C. Electrical modulus study indicates a non-Debye behavior of the material. A detailed study of bulk conductivity shows electric conduction in the material as a thermally activated process. |
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Keywords: | Ceramics Chemical method X-ray diffraction Impedance spectroscopy Transport phenomena |
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