ELECTRICAL PROPERTIES OF (Na1/2Bi1/2)1-xCaxTiO3 CERAMICS
The frequency (100Hz–1MHz) and temperature (30–575°C) dependence of electrical properties of calcium doped (Ca = 0.01, 0.05, 0.1) sodium bismuth titanate (NBT) was investigated by impedance spectroscopy. The data is used to analyze the effect of calcium concentration on the electrical properties of NBT. The frequency explicit plots of Z′′ versus frequency at various temperatures shows peaks in the higher temperature range (>400°C). The relaxation peaks are affected by the doping. The AC conductivity values are computed from the impedance data. DC conductivity has been measured in the temperature range of 30–400°C. The activation energies have been evaluated from the data. From the studies of dielectric constant as a function of temperature, it is observed that diffuse phase transition (DPT) is exhibited in these samples.