Comments on the Substitution Mechanism of Mg-Doped LiTaO 3 Ceramics

Many properties of LiTaO 3 are influenced by insertion or substitution of the element in this network. We focus our attention on the existence of the defects in the structure of materials LiTaO 3 to determine the substitution mechanism of Mg-doped these compounds for different levels. A new approach based on the variation of the Curie-temperature is introduced an d combined with different vacancy models to explain the mechanism of substitution of Mg in LiTaO 3; the calculated values of T C are close to the experimental data. Keyword: Ceramics; Defects; Models; Phase transition; LiTaO 3.