Development of Na+ superionic conducting Na5YSi4O12-type glass-ceramics

Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano, Hachioji-shi, Tokyo 192-0015, Japan

Adv. Mater. Lett., 2019, 10 (2), pp 85-90

DOI: 10.5185/amlett.2019.1684

Publication Date (Web): Dec 19, 2018

Copyright © IAAM-VBRI Press

E-mail: okura@cc.kogakuin.ac.jp

Abstract

This review article describes a series of studies on the glass-ceramic Na⁺ superionic conductors with Na₅YSi₄O₁₂ (N5)-type structure synthesized using the composition formula of Na_3+3x-yR_1-xP_ySi_3-yO₉ for a variety of rare earth elements, R, under the appropriate composition parameters. Recent researches on structural control of the Na⁺ superionic conducting glass-ceramics are also introduced. The optimum conditions for crystallization were discussed with reference to the conduction properties and the preparation of crack-free N5-type glass-ceramics. The effects of Si substitution with the various elements with tetrahedral oxygen coordination structure and Y substitution with the various R elements were also discussed on ionic conductivity of N5-type glass-ceramics, respectively. 

Keywords

Superionic conductor, glass-ceramics, crystallization, Na₅YSi₄O₁₂-type, microstructure.