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J. Korean Ceram. Soc. > Volume 34(7); 1997 > Article
Journal of the Korean Ceramic Society 1997;34(7): 685.
열처리조건이 두 NASICON 조성의 소결 및 전기적특성에 미치는 영향
강희복, 조남희, 김윤호1
인하대학교 무기재료공학과
1한국과학기술연구원 세라믹스 연구부
Effects of Heat-treatment Condition on the Characteristics of Sintering and Electrical Behaviors of Two NASICON Compounds
ABSTRACT
Effects of sintering temperature and time on the phase formation, the characteristics of sintering and electrical behaviors of NASICON compounds with Na3Zr2Si2PO12 and Na3.2Zr1.3Si2.2P0.8O10.5 compositions synthesized by solid state reaction were investigated. Maximum relative densities of 96% and 91% were obtained for Na3Zr2Si2PO12 and Na3.2Zr1.3Si2.2P0.8O10.5 compounds, respectively. Complex impedance analysis in a frequency range below 4 MHz was performed to measure the ionic conductivity and migration barrier height of the compounds at RT-30$0^{circ}C$. The maximum ionic conductivity and the minimum migration barrier height were 0.45 ohm-1cm-1 and 0.07 eV, respectively. The migration barrier height of the high temperature form (space group : R3c) is about 30-40% of that of the low temperature form (space group : C2/c) in two NASICON compounds. Ionic conductivity increases with increasing sinterability, and the presence of glass phase in Na3.2Zr1.3Si2.2P0.8O10.5 compounds lowers significantly ionic conductivity at temperatures above 14$0^{circ}C$.
Key words: NASICON, Sintering bevavior, Ionic conductivity, Migration barrier height
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