• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Spectroscopic studies on the structure of vanadium tellurite glasses
【24h】

Spectroscopic studies on the structure of vanadium tellurite glasses

机译：钒碲酸盐玻璃结构的光谱研究

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

Glasses having the compositions xV_2O_5 centre dot (1-x) TeO_2 with x=0.04, 0.1, 0.18 and 0.25 were studied by means of optical absorption (UV-VIS-NIR), infrared, Raman and electron paramagnetic resonance spectroscopies. According to the latter method the [V~(4+)]/([V~(5+)]+[V~(4+)]) ratio steadily decreases with increasing V_2O_5 concentration from 9.0 to 2.4 percent. The UV-VIS spectra reveal a shift in cut-off to higher wavelength indicating structural changes. Infrared and Raman spectra show the occurrence of tellurium in this system as trigonal TeO_4 bipyramids, TeO_3 trigonal pyramids and TeO_(3+1) polyhedra. By increasing the V_2O_5 concentrations, a transformation of TeO_4 into TeO_(3+1) polyhedra and TeO_3 units has been observed. A high wavenumber band located around 910 cm~(-1) which could be assigned to vibrations of short V-O bonds shows a blue shifted with increasing V_2O_5 content revealing the presence of both VO_4 tetrahedra and VO_5 bipyramids.
机译：通过光吸收（UV-VIS-NIR），红外，拉曼和电子顺磁共振波谱研究了具有x ＝ 0.04、0.1、0.18和0.25的组成为xV_2O_5中心点（1-x）TeO_2的玻璃。根据后一种方法，[V〜（4 +）] /（[V〜（5 +）] + [V〜（4+）]）的比例随着V_2O_5浓度从9.0％增加到2.4％逐渐降低。 UV-VIS光谱揭示了截止点向更高波长的偏移，表明结构发生了变化。红外光谱和拉曼光谱显示碲在此系统中的存在形式为三角TeO_4双锥体，TeO_3三角锥体和TeO_（3 + 1）多面体。通过增加V_2O_5浓度，已观察到TeO_4转变为TeO_（3 + 1）多面体和TeO_3单元。可以分配给短V-O键振动的位于910 cm〜（-1）附近的高波数带显示蓝色随V_2O_5含量的增加而发生蓝移，表明同时存在VO_4四面体和VO_5双锥体。

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