EXAFS Study on Selenium-Tellurium Mixed Chains
EXAFS Study on Selenium-Tellurium Mixed Chains
复制标题
硒碲混合链的 EXAFS 研究
DOI：
10.1143/jpsj.57.553
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发表时间：
1988
影响因子：
1.7
通讯作者：
H. Endo
中科院分区：
文献类型：
--
作者：
M. Inui;M. Yao;H. Endo
对于限制在丝光沸石通道中的孤立 Se-Te 混合链以及三角和无定形 Se-Te 混合物，在 Se K 边缘上采用了扩展 X 射线吸收精细结构 (EXAFS)。 Se-Te链分子中的Se-Se和Se-Te键长是利用Se和Te之间向后散射的波矢量依赖性的巨大差异来确定的。发现孤立链中的 Se-Se 和 Se-Te 键比三角混合物中的短，这表明链内共价键通过减少链间耦合而得到加强。混合链分子中的Se-Se键随着Te的加入而伸长，而Se-Te键变化不大。
Extended X-ray absorption fine structure (EXAFS) has been taken on the Se K-edge for isolated Se-Te mixed chains confined in the mordenite channels, as well as for trigonal and amorphous Se-Te mixtures. The Se-Se and Se-Te bond lengths in the Se-Te chain molecules have been determined by utilizing large difference in the wave vector dependence of backward scattering between Se and Te. The Se-Se and Se-Te bonds in the isolated chains are found to be shorter than those in the trigonal mixtures, which suggests that the intrachain covalent bonds are strengthened by reducing the interchain coupling. The Se-Se bond in the mixed chain molecule elongates with addition of Te, while the Se-Te bond changes little.