Complex Impedance Spectra of  <TEX>$Li_{0.5}La_{0.5}TiO_3$</TEX>-Based Ionic conductors

,; ,; ,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 33(10); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(10): 1073.

$Li_{0.5}La_{0.5}TiO_3$계 이온전도체의 복소임피던스 특성

유광수, 이종숙¹, 김태송¹

서울시립대학교 재료공학과
¹한국과학기술연구원 세라믹스 연구부

Complex Impedance Spectra of $Li_{0.5}La_{0.5}TiO_3$-Based Ionic conductors

ABSTRACT

The dense Li0.5La0.5TiO3 and Li0.5(Ln0.2La0.3) TiO3 (Ln=Nd, Gd) ionic conductors were prepared by change of processing conditions and obtained superstructures with doubling of c-axis by substitution of Nd and Gd. As results of complex impedance analysis through separation of bulk and grain boundary impedances substitu-tion of Nd and Gd in Li0.5(Ln0.2La0.3) TiO3 affected on the relative decrease of grain boundary impedance and conductivies by grain boundary relatively increased as increasing temperature. The electrical conductivity of Li0.5Ln0.2TiO3 at room temperature was approximately 10-3$Omega$-1cm-1 and the Arrhenius plot of bulk conducti-vity showed a transition point at about 22$0^{circ}C$

Key words: $Li_{0.5}La_{0.5}TiO_3$, lonic conductivity, Complex impedance