Scholarlink

<p>This study investigates the effect of SiO<sub>2</sub> addition on ionic conductivity and stability against crystallization in Ag<sub>2</sub>O-Al<sub>2</sub>O<sub>3</sub>-P<sub>2</sub>O<sub>5</sub> glasses. It is shown that there is an increase in ionic conductivity values, crystallization stability, and glass transition temperature and a decrease in activation energy of the samples with increasing SiO<sub>2</sub> content. This improvement is attributed to the cross-linking of phosphate structures by Q<sup>2</sup>P, Q<sup>3</sup>P, Q<sup>4</sup>P, and possibly Q<sup>6</sup>Si structural units integrated into the glass matrix, leading to the formation of Si–O-Si, Si–O-Al and Si–O-P bonds. The presence of Q<sup>2</sup>Si structural units within phosphate chains contributes to an increase in their average length. The increase in the free volume and volume concentration of charge carriers and the decrease in steric hindrance to diffusion resulting from structural transformations have a positive effect on ionic conductivity. It has been shown that an increase in SiO<sub>2</sub> content from 0 to 15&#xa0;mol% results in a 4.75-fold increase in specific ionic conductivity, from 1.06 to 5.04 S·cm<sup>−1</sup> at 393&#xa0;K, accompanied by a decrease in activation energy from 0.62 to 0.52&#xa0;eV.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of SiO2 on the ionic conductivity parameters and short-range order structure of Ag2O-Al2O3-P2O5 glasses

  • 期刊论文

  • 发表日期：

    2025年4月23日

查看全文
  • Talib Farziev,
  • Viktor Markov,
  • Nikita Dybin,
  • Ilia Kaliya,
  • Valentina Andreeva

摘要

This study investigates the effect of SiO2 addition on ionic conductivity and stability against crystallization in Ag2O-Al2O3-P2O5 glasses. It is shown that there is an increase in ionic conductivity values, crystallization stability, and glass transition temperature and a decrease in activation energy of the samples with increasing SiO2 content. This improvement is attributed to the cross-linking of phosphate structures by Q2P, Q3P, Q4P, and possibly Q6Si structural units integrated into the glass matrix, leading to the formation of Si–O-Si, Si–O-Al and Si–O-P bonds. The presence of Q2Si structural units within phosphate chains contributes to an increase in their average length. The increase in the free volume and volume concentration of charge carriers and the decrease in steric hindrance to diffusion resulting from structural transformations have a positive effect on ionic conductivity. It has been shown that an increase in SiO2 content from 0 to 15 mol% results in a 4.75-fold increase in specific ionic conductivity, from 1.06 to 5.04 S·cm−1 at 393 K, accompanied by a decrease in activation energy from 0.62 to 0.52 eV.