Microstructural Effects on Sodium Ion Conduction Properties of Grains and Grain Boundaries of Na5YSi4O12-Type Silicophosphate Glass-Ceramics

DOI Web Site 被引用文献2件 参考文献39件
  • OKURA Toshinori
    Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University
  • KAWADA Koji
    Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University
  • YAMASHITA Kimihiro
    Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University Advanced Central Research Organization, Teikyo University

書誌事項

タイトル別名
  • Microstructural effects on sodium ion conduction properties of grains and grain boundaries of Na<sub>5</sub>YSi<sub>4</sub>O<sub>12</sub>-type silicophosphate glass-ceramics

説明

<p>We studied the effects of crystallization conditions on the conduction properties of the Na5YSi4O12-type sodium ion conducting glass-ceramics. Crystallization process was controlled by varying annealing parameters of nucleation time (0–200 h) and crystal growth temperature (900–1100 °C). The present results showed that a shorter nucleation time with annealing at 900 °C for crystal growth gave rise to higher conductivities of 5 × 10−2 S cm−1 at representative temperatures of 300 °C and 3 × 10−3 S cm−1 at 150 °C, respectively. Those results were attributed to the microstructures of glass-ceramics and the conductivities of a whole glass-ceramic were considered to be dominated by those of grains at 300 °C and, on the other hand, strongly influenced by those of grain boundaries at 150 °C. It was found that the dependence of a whole conductivity on the apparent number of grain boundaries calculated as the ratio of a whole thickness to an average grain diameter was stronger in the measurements at 150 °C than at 300 °C. Considering the result, we propose the use of largely grained glass-ceramics for both higher and lower temperature uses.</p>

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