Synthesis and Na⁺ conduction properties of Nasicon-type glass-ceramics in the system Na₂O-Y₂O₃-X₂O₃-SiO₂ (X = B, Al, Ga) and effect of Si substitution

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• 作者：Toshinori Okura ; Koji Kawada ; Naoya Yoshida ; Hideki Monma ; Kimihiro Yamashita
• 关键词：Superionic conductor ; Nasicon-type ; Glass-ceramics ; Crystallization
• 刊名：Solid State Ionics
• 出版年：2012
• 出版时间：4 October, 2012
• 年：2012
• 卷：225
• 期：Complete
• 页码：367-370
• 全文大小：1241 K

文摘

Glass-ceramics of the boron-, aluminium- or gallium-containing Na₅RSi₄O₁₂-type (R = rare earth; Y) Na⁺-superionic conductors were prepared by crystallization of glasses with the composition Na_{3 + 3x + y}Y_1?xX_ySi_3?yO₉ (X = B; NaYBSi, X = Al; NaYAlSi, X = Ga; NaYGaSi) (x = 0.2, y = 0.1). The crystallization kinetics of the glasses was examined by DTA, 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 activation energies of crystal growth of the NaYBSi, NaYAlSi and NaYGaSi glasses with the Na_3.7Y_0.8B_0.1Si_2.9O₉, Na_3.7Y_0.8Al_0.1Si_2.9O₉ and Na_3.7Y_0.8 Ga_0.1Si_2.9O₉ compositions were 410, 392 and 382 kJ/mol, respectively. The conductivities of the glass-ceramic NaYBSi, NaYAlSi and NaYGaSi were 4.32 ¡Á 10^? 2, 3.73 ¡Á 10^? 2 and 3.40 ¡Á 10^? 2 S/cm at 300 ¡ãC, respectively.