...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Sub-T-g phase separation and devitrification of a lithium triborate sol-gel glass
【24h】

Sub-T-g phase separation and devitrification of a lithium triborate sol-gel glass

机译：三硼酸锂溶胶-凝胶玻璃的Sub-T-g相分离和失透

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Sol-gel synthesis of glassy lithium triborate, Li2O-3B(2)O(3), its structural characterization and the changes induced by thermal annealing are described. The as prepared glass consists of chains of six-membered B-O rings having two trigonal and one tetrahedral boron. A relatively small fraction of the rings is hydrolyzed and two borons per formula unit are bonded to methoxy groups. Thermal annealing at less than or similar to 270 degrees C causes release of most of the -OH as water, the formation of highly mobile ring-based units, and partial structural reordering. Annealing at higher temperatures leads to loss of methoxy groups and a sub-T-g phase separation, that leads to the formation of crystalline lithium diborate and glassy lithium tetraborate. The sample annealed for 6 h at 500 degrees C is almost fully polymerized and displays a crystalline phase and medium-range structure very similar to melt-quenched lithium triborate.
机译：描述了玻璃态的三硼酸锂，Li2O-3B（2）O（3）的溶胶-凝胶合成，结构表征和热退火引起的变化。所制备的玻璃由具有两个三角形和一个四面体硼的六元B-O环链组成。相对小部分的环被水解，每个式单元的两个硼键合到甲氧基上。在低于或接近270摄氏度的温度下进行热退火会导致大部分-OH释放为水，形成高度可移动的基于环的单元，并进行部分结构重排。较高温度下的退火导致甲氧基的损失和亚T-g相分离，从而导致结晶出二硼酸锂和玻璃状四硼酸锂的形成。在500摄氏度下退火6小时的样品几乎完全聚合，并显示出晶相和中等范围的结构，与熔融淬火的三硼酸锂非常相似。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号