SINTERING BEHAVIOR AND DIELECTRIC CHARACTERISTICS OF LITAO3 WITH THE ADDITION OF (MG2+TIO2)

Abstract

Densified LiTaO3-type ceramics can be obtained by sintering at 900-degrees-C after the addition of MgF2 or (MgF2 + LiF) mixture. Partial hydrolysis of MgF2 produces an MgO layer on top of the sample. Space charge polarization occurs at high temperatures between the MgO layer and the LiTaO3 matrix, inducing a large dielectric constant predominating over the ferroelectric Curie peak of the sample. The TiO2 dopant lowers the Curie temperature of the sample as the cation concentration increases. In addition, it is observed that substitution of Ta ions with Mg ions results in the formation of Ta2O5.