Atomic structure and chemical order in binary Ge–Te and As–Te glasses: A Te K-edge X-ray absorption fine structure spectroscopic study
Atomic structure and chemical order in binary Ge–Te and As–Te glasses: A Te K-edge X-ray absorption fine structure spectroscopic study
复制标题
DOI：
10.1016/j.jnoncrysol.2008.05.048
复制
发表时间：
2008-10
影响因子：
3.5
通讯作者：
S. Sen;S. Joshi;B. Aitken;S. Khalid
中科院分区：
文献类型：
--
作者：
S. Sen;S. Joshi;B. Aitken;S. Khalid
用Te K边EXAFS谱研究了GexTe 100 − x玻璃（x=15和20）和AsxTe 100 − x玻璃（x = 40 × 1065）中Te原子的最近邻配位环境。所有玻璃中Te原子的平均配位数为1.20，没有观察到违反8-N规则。Te原子的第一配位壳层的组成组成表明，化学顺序在很大程度上保留在两个玻璃形成的二元系统。Te配位环境的突然变化和违反化学顺序观察到在化学计量的As 40 Te 60玻璃暗示形成的约束网络。在这两个系统中的物理性质的组成依赖性可以与短程化学顺序。
The nearest-neighbor coordination environments of Te atoms in GexTe100−xglasses with x=15 and 20 and in AsxTe100−xglasses with 40⩽x⩽65 have been studied with Te K-edge EXAFS spectroscopy. The average coordination number of Te atoms in all glasses is found to be ∼2.0 and no violation of the 8-N rule is observed. The compositional makeup of the first coordination shell of Te atoms indicates that chemical order is largely preserved in both glass-forming binary systems. Sudden changes in the Te coordination environment and violation of chemical order are observed at the stoichiometric As40Te60glass implying formation of a constrained network. The compositional dependence of the physical properties in both systems can be correlated to short-range chemical order.