Thermoelectric power of undoped and aluminium oxide doped ferroelectric potassium vanadate and cesium vanadate

Abstract The thermoelectric power(s) of pure and aluminium oxide doped ferroelectric potassium vanadate and cesium vanadate have been determined in the temperature range covering their transition temperature. The thermoelectric power is found to increase linearly with temperature, attains maximum value and with further increase in temperature decreases to zero indicating transition temperature of the respective samples while it changes sign for higher temperature. The thermoelectric power of KVO3 and CsVO3 increases with increase in doping concentration of Al2O3up to 0.1 mol. %, however, it decreases with further increase in doping concentration. It is observed that pure and aluminium doped KVO3 and CsVO3 materials show p-type behaviour in ferroelectric state andn-type behaviour in paraelectric state.