Effect of substitution of Si with V and Mo on ionic conductivity of Na₅YSi₄O₁₂-type glass-ceramics

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• 作者：Toshinori Okura ; Tatsuya Takahashi ; Hideki Monma ; Kimihiro Yamashita
• 关键词：Na₅YSi₄O₁₂-type ; Glass-ceramics ; Crystallization ; Conduction properties ; Ionic transport number
• 刊名：Solid State Ionics
• 出版年：2008
• 出版时间：30 September 2008
• 年：2008
• 卷：179
• 期：27-32
• 页码：1291-1295
• 全文大小：660 K

文摘

Glass-ceramics of the vanadium- or molybdenum-containing Na₅RSi₄O₁₂-type (R = rare earth; Y) Na⁺-superionic conductors were prepared by crystallization of glasses with the compositions Na_3+3x−yY_1−xV_ySi_3−yO₉ (NYVS) or Na_3+3x−2yY_1−xMo_ySi_3−yO₉ (NYMS), and the effects of V or Mo elements on the separation of the phase and the microstructural effects on the conduction properties of glass-ceramics were discussed. The conductivities of the glass-ceramic NYVS and NYMS with the Na_3.9Y_0.6V_0.3Si_2.7O₉ and Na_3.7Y_0.7Mo_0.1Si_2.9O₉ compositions were 0.87 × 10^{− 2} and 3.58 × 10^{− 2}S/cm at 300°C, respectively, and the Na⁺ ionic transport numbers of these glass-ceramics determined by Wagner polarization method were nearly 0.9 and 1 at 300°C, respectively.