...
  • 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 >Nearly constant dielectric loss of polyhydric alcohols
【24h】

Nearly constant dielectric loss of polyhydric alcohols

机译：多元醇的介电损耗几乎恒定

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

Complex permittivity measurements have been performed on a series of polyhydric alcohols (glycerol, threitol, xylitol and sorbitol) and mixtures of glycerol-xylitol and xylitol-sorbitol in the frequency range between 100 Hz and 1 MHz at temperatures from 293 K down to 50 K. It was found that all the systems including the mixtures show the nearly constant dielectric loss (NCL) at temperatures far below the glass transition temperature. The parameters describing the NCL depend on the number of carbons in the molecules. This relation can also be applied for the mixture with the mean values for the number of carbons. The parameters describing the behavior of the alpha process, such as the fragility index, depend the number of carbons in this series of polyhydric alcohols. Degree of freedom in the intermolecular interactions connected with the fragility index can be considered to relate to the NCL. This is consistent with the caged dynamics as a possible microscopic origin for the NCL. Although the fast beta process is not denied by the NCL, coexistence of these processes being able to explain the dielectric loss minima, should be examined experimentally in future. (c) 2006 Elsevier B.V. All rights reserved.
机译：在293 K至50 K的温度范围内，在100 Hz至1 MHz的频率范围内，对一系列多元醇（甘油，苏糖醇，木糖醇和山梨糖醇）以及甘油-木糖醇和木糖醇-山梨糖醇的混合物进行了复介电常数测量。已经发现，包括混合物的所有系统在远低于玻璃化转变温度的温度下显示出几乎恒定的介电损耗（NCL）。描述NCL的参数取决于分子中碳的数量。该关系也可以应用于具有碳数平均值的混合物。描述α过程行为的参数（例如脆性指数）取决于该系列多元醇中的碳数。与脆性指数相关的分子间相互作用的自由度可以被认为与NCL有关。这与笼式动力学作为NCL可能的微观起源是一致的。尽管NCL并未拒绝快速beta进程，但是这些进程的共存能够解释介电损耗的最小值，应在未来进行实验性检验。 （c）2006 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