...
  • 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 >Local order around of germanium atoms in Ga10Ge25S65 glass by EXAFS
【24h】

Local order around of germanium atoms in Ga10Ge25S65 glass by EXAFS

机译：通过EXAFS在Ga10Ge25S65玻璃中锗原子周围的局部有序

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

Irreversible photoexpansion effect has been observed in amorphous Ga10Ge2S65 glasses when its surface was exposed to light with energy greater than the band gap, 3.52 eV. A volume change of about 5% was reached in bulk samples by controlling illumination time and the laser power density. To understand the atomic scale processes of the photoexpansion effect, extended X-ray absorption fine structure (EXAFS) spectroscopy has been used as a local probe of the germanium environment in the glass samples before and after illumination. Modifications are observed in the average coordination shell around Ge atoms in the illuminated sample compared to the non-illuminated one. For the non-illuminated sample, the Ge coordination shell is described by a distorted tetrahedron of sulfur atoms at around 2.20 Angstrom. After illumination, the EXAFS signal can be explained by introducing an additional contribution to this average environment. Based on an analysis of the EXAFS data we proposed a two-shell model of 0.5 oxygen atoms at 2.01 Angstrom and 3.6 sulfur atoms at a 2.20 Angstrom. The existence of Ge-O bonds in the glass after illumination was confirmed by infrared measurements. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 21]
机译：当非晶态Ga10Ge2S65玻璃的表面暴露于能量大于带隙3.52 eV的光中时，已观察到不可逆的光膨胀效应。通过控制照明时间和激光功率密度，可在大块样品中达到约5％的体积变化。为了了解光膨胀效应的原子尺度过程，在照明前后，扩展的X射线吸收精细结构（EXAFS）光谱已用作玻璃样品中锗环境的局部探针。与未光照样品相比，在光照样品中Ge原子周围的平均配位壳中观察到了修饰。对于不发光的样品，Ge配位壳由约2.20埃的变形的硫原子四面体描述。照明后，可以通过引入对该平均环境的额外贡献来解释EXAFS信号。在对EXAFS数据进行分析的基础上，我们提出了一个两壳模型，该模型由一个2.01埃的0.5氧原子和一个2.20埃的3.6硫原子组成。通过红外测量证实照明后玻璃中Ge-O键的存在。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：21]

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