Electrical properties of Mg-doped LiTaO3 ceramics

The ac impedance of ceramic samples of Mg-doped LiTaO3 has been measured over the temperature range 600–800 °C. It can be modelled by an equivalent circuit composed of a “dielectric element” R1C1C2 in parallel with a “leakage resistance” R2. The series component R1C1, represents the polarisation associated with domain reorientation: C1 passes through a maximum at Tc at the same time as R1 passes through an approximate minimum. C2 represents the bulk polarisation, R2 shows linear Arrhenius behaviour. lid solution were characterised by XRD and the formation mechanism was proposed. The variation of electrical properties with composition is discussed.