The IMPEDANCE STUDY OF K2DyV5O15 CERAMICS
The polycrystalline sample of K2DyV5O15 (KDV), a new member of the tungsten bronze structural family, was prepared by a mixed-oxide method relatively at low temperature, (i.e., 5000C). X-ray diffraction studies of the compound showed the formation of single phase orthorhombic crystal structure at room temperature. SEM micrograph showed the homogeneous distribution of grains throughout the sample. Electric properties were analyzed using the complex impedance spectroscopy. The bulk impedance evaluated from the Nyquist plots was observed to decrease with the rise in temperature, showing a negative temperature coefficient of resistance. The variation of ac electrical conductivity (σac) was measured in a temperature (-1000 to 250C) and frequency (102-106 Hz) range which exhibited presence of non-Debye type of relaxation. The impedance plots exhibited multiple relaxation phenomenon.
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