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1 2010

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Impedance and modulus spectroscopy studies of Ba4SrSmTi3V7O30 ceramics

Sahoo P. S., Panigrahi A., Patri S. K., Choudhary R. N. P.

Materials Science Poland

2010

Vol. 28, No. 4

764--772

Modulus and impedance spectroscopy studies on barium strontium samarium vanadate (Ba4SrSmTi3V7O30) were carried out, as functions of frequency (1 kHz-1 MHz) and temperature (31-500 °C). XRD analysis of Ba4SrSmTi3V7O30 ceramic revealed the formation of single phase compound in an orthorhombic structure. The Cole-Cole plots showed a non-Debye type of dielectric relaxation. The dc and ac analyses of Ba4SrSmTi3V7O30 reveal typical negative temperature coefficient of resistance (NTCR) behaviour. The electric modulus, which describes the dielectric relaxation of the compound, is fitted to the Kohlrausch exponential function. Modulus analysis suggests the existence of a hopping mechanism for the electrical transport processes of the material.