Na⁺ SUPERIONIC CONDUCTORS OF GLASS-CERAMICS IN THE SYSTEM Na₂O-Y₂O₃-Al₂O₃-SiO₂

Abstract

Glass-ceramics of the aluminium-containing Na⁺-superionic conductors were prepared by crystallization of glasses with the composition Na_3+3x+yY_1-xAl_ySi_3-yO₉, and the effects of Al element on the separation of the phase and the microstructural effects on the conduction properties of glass-ceramics were discussed. Na₅YSi₄O₁₂-type glass-ceramics were obtained as a stable phase at high-temperatures. The ionic conductivity of Na_3.7Y_0.8Al_0.1Si_2.9O₉ was 3.13x10^-2 S/cm at 300 degC.