...
  • 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 >Viscosity, relaxation and elastic properties of photo-thermo-refractive glass
【24h】

Viscosity, relaxation and elastic properties of photo-thermo-refractive glass

机译：光热折射玻璃的粘度，松弛和弹性

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

Viscometry, ultrasonic echography and mechanical spectroscopy were applied to explore the thermo-mechanical properties of a photo-thermo-refractive (PTR) glass. Newtonian shear viscosity and ultrasonic velocity were used to determine the Maxwell time of structural relaxation. Two fast relaxation modes are found in PTR glass below glass transition temperature, which are attributed to alkali and mixed cation mobility. Respective activation energies, E-gamma = 72 +/- 4 kJ mol(-1) and E-beta = 117 +/- 4 kJ mol(-1), are considerably lower than that Of viscous flow at the glass transition E, 465 kJ mol-1 as quantified from mechanical spectroscopy. Decoupling ratios of E-gamma/E-alpha = 0.155 and E(beta)J(alpha), = 0.255 are similar to those of sodium trisilicate glass but at considerably longer timescales. These observations imply that beta- and gamma-relaxations are delayed as local structural arrangements are more complex for the multi-component PTR glass. (c) 2008 Elsevier B.V. All rights reserved.
机译：粘度计，超声回波描记术和机械光谱学被用于探索光热折射（PTR）玻璃的热机械性能。使用牛顿剪切粘度和超声速度确定结构松弛的麦克斯韦时间。在低于玻璃化转变温度的PTR玻璃中发现了两种快速弛豫模式，这归因于碱和混合阳离子迁移率。相应的活化能E-γ= 72 +/- 4 kJ mol（-1）和E-beta = 117 +/- 4 kJ mol（-1）大大低于玻璃化转变温度E时的粘性流，由机械光谱法定量得到的465 kJ mol-1。 E-γ/E-α＝ 0.155和EβJα＝ 0.255的去耦比类似于三硅酸钠玻璃的去耦比，但是在相当长的时间尺度上。这些观察结果暗示，由于多组分PTR玻璃的局部结构排列更为复杂，因此β和γ弛豫被延迟了。 （c）2008 Elsevier B.V.保留所有权利。

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