Structure and Properties of <tex>$LiTaO_3$</tex> Type Solid Solutions in <tex>$Li_2O-Al_2O_3-Ta_2O_5$</tex> Ternary System

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J. Korean Ceram. Soc. > Volume 33(4); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(4): 405.

$Li_2O-Al_2O_3-Ta_2O_5$ 삼성분계에 있어 $LiTaO_3$ 고용체의 구조 및 특성에 관한 연구

김정돈, 흥국선¹, 주기태²

한국과학기술원 세라믹스 연구실
¹서울대학교 무기재료공학과
²한국과학기술연구원 세라믹스 연구실

Structure and Properties of $LiTaO_3$ Type Solid Solutions in $Li_2O-Al_2O_3-Ta_2O_5$ Ternary System

ABSTRACT

The partial substitution of LiTaO3 with Al2O3 caused the variation of dielectric properties and a lower melting temperature yielding an easier growth of single crystal. The lattice constants and Raman band broadening were measured for the LiTaO3 solid solution in which the cations of Li+ and Ta5+ were partially substituted by Al3+ cation. The LiTaO3 type limit phases were obtained. ; Li1.15Al0.45Ta0.7O3 for cationic excess Li1.15Al0.45Ta0.7O3 for stoichiometry Li0.85Al0.05TaO3 for cationic deficit. The second phase was formed beyond the solubility limit. The limit phase (Li0.85Al0.05TaO3) in the region of cationic deficit showed the lowest Cuire temperature of 61$0^{circ}C$ and melting point of 152$0^{circ}C$ compared to the solid solutions in other regions (TMp=1$650^{circ}C$, Tc=69$0^{circ}C$ for LiTaO3)

Key words: $LiTaO_3$, Solid solution, Ferroelectrics