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1 Materials Science Poland

1 2013

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Effect of simultaneous substitution of magnesium and niobium on dielectric properties and phase transition temperature of bismuth sodium barium titanate ceramics

Zereffa E. A., Prasad Rao A. V.

Materials Science Poland

2013

Vol. 31, No. 2

201--210

Department of Inorganic and Analytical Chemistry, College of Science and Technology, Andhra University, Visakhapatnam – 530003 (Bi1/2Na1/2)0.94Ba0.06Ti1-x(Mg1/3Nb2/3)xO3 ceramic samples with x = 0.0, 0.01, 0.05, 0.15, 0.20 were synthesized by solid state method. Microstructure, dielectric properties, impedance and conductivity of the ceramics were studied. Phase formation was confirmed by X-ray diffraction. Co-doping of the ceramics with Mg and Nb at x = 0.01 raised the dielectric constant from 6510 to 8225 at the frequency of 1 KHz. Further increase in (Mg1/3Nb2/3)4+ concentration up to 0.15 increased the transition temperature from 275 °C to 339 °C and lowered the dielectric constant. The ac impedance measurements showed a linear response with frequency at lower temperature indicating insulating behavior and a single semicircular arc with spike at higher temperature.