Ionic conductivities of Nasicon-type glass-ceramic superionic conductors in the system Na₂O–Y₂O₃–XO₂–SiO₂ (X = Ti,

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• 作者：Toshinori Okura ; Mitsugu Saimaru ; Hideki Monma ; Kimihiro Yamasita
• 关键词：Ionic conductivities ; Nasicon-type ; Glass-ceramics ; Crystallization
• 刊名：Solid State Ionics
• 出版年：2009
• 出版时间：14 May 2009
• 年：2009
• 卷：180
• 期：6-8
• 页码：537-540
• 全文大小：354 K

文摘

Glass-ceramics of the titanium-, germanium- or tellurium-containing Na₅RSi₄O₁₂-type (R = rare earth; Y) Na⁺-superionic conductors (N5YXS) were prepared by crystallization of glasses with the composition Na_3+3xY_1 − xX_ySi_3 − yO₉ (X = Ti; NYTiS, Ge; NYGeS, X = Te; NYTeS), and the effects of X elements on the separation of the phase and the microstructural effects on the conduction properties of glass-ceramics were discussed. The combination of x and y was most varied in N5YGeS and more limited in the order of N5YTeS > N5YTiS. Their conductivities and activation energies are of the order of 10^− 2 S/cm at 300 °C and of 15 to 24 kJ/mol, respectively. The conductivity of the glass-ceramic N5YXS decreases giving the order N5YGeS > N5YTeS > N5YTiS. It is considered that this order corresponds to the N5 single phase region. Large enhancement of electrical conductivity was observed in the glass-ceramics as the grain growth was promoted with increase of heating temperature and heating time for crystallization.