Electrical properties of Mg-doped LiTaO3 ceramics

Abstract The ac impedance of ceramic samples of Mg-doped LiTaO 3 has been measured over the temperature range 600–800 °C. It can be modelled by an equivalent circuit composed of a “dielectric element” R 1 C 1 C 2 in parallel with a “leakage resistance” R 2 . The series component R 1 C 1 , represents the polarisation associated with domain reorientation: C 1 passes through a maximum at T c at the same time as R 1 passes through an approximate minimum. C 2 represents the bulk polarisation, R 2 shows linear Arrhenius behaviour. The solid solution were characterised by XRD and the formation mechanism was proposed. The variation of electrical properties with composition is discussed.