Abstract
Barium orthovanadate (Ba3V2O8), a derivative of perovskite family has been prepared using a mixed-oxide technique. The room temperature X-ray diffraction analysis has confirmed the formation of a single phase compound in trigonal crystal structure. The study of microstructure by scanning electron microscopy shows that the compound has well defined grains, distributed uniformly throughout the surface. The studies of dielectric parameters (εr and tan δ) of the compound as a function of temperature at three different frequencies (100, 500, 1,000 kHz) exhibit that they are almost temperature independent at low and medium temperature ranges. Detailed studies of impedance and related parameters exhibit that the electrical properties of the material are strongly dependent on temperature, and bear a good correlation with its microstructures. The bulk resistance, evaluated from complex impedance spectra, is found to be decreasing with rise in temperature. It shows that the material has negative temperature co-efficient of resistance similar to that of semiconductors. The same behaviour has also been observed in the study of I–V characteristics of the material. The complex electric modulus analysis indicates the possibility of hopping conduction mechanism in the system with non-exponential type of conductivity relaxation. The nature of variation of dc conductivity with temperature confirms the Arrhenius behavior of the material. The ac conductivity spectra show a typical signature of an ionic conducting system, and are found to obey Jonscher’s universal power law.
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The authors would like to acknowledge the kind help of Dr. B. Mishra, Principal scientist, Dalmia Institute of Scientific and Industrial Research (DISIR), Rajgangpur, Odisha and IIT Kharagpur in carrying out some experimentation.
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Pati, B., Sutar, B.C., Parida, B.N. et al. Dielectric and impedance spectroscopy of barium orthovanadate ceramics. J Mater Sci: Mater Electron 24, 1608–1616 (2013). https://doi.org/10.1007/s10854-012-0983-3
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DOI: https://doi.org/10.1007/s10854-012-0983-3