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

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  • 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

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

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<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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