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Silver diffusion anomaly in Cu-Ag-As-Se glasses: a chalcogen site analysis using Te-125-Mossbauer spectroscopy

机译:Cu-Ag-As-Se玻璃中的银扩散异常:使用Te-125-Mossbauer光谱法进行硫族元素位点分析

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Te-125-Mossbauer spectroscopy was used in order to study the change in the local chalcogen environment of Cu-Ag-As-Se glasses showing anomalies in the Ag+ ion transport. These ion-conducting glasses with a constant silver content of 15 at.% and variable copper concentration, x, exhibit (i) a dramatic decrease in the Ag-110 tracer diffusion coefficient, D-Ag, by two orders of magnitude at 0 less than or equal to x less than or equal to, 10, and (ii) a nearly complete D-Ag recovering at 10 less than or equal to x less than or equal to 20. The parabolic shape of D-Ag is accompanied by a similar composition dependence of the quadrupole splitting, QS, which reflects changes in the Te-M (M = Ag, Cu) and Se-Ag interatomic distances. The minimal chalcogen - silver distance at x = 10 at.% Cu corresponds to the minimal value of D-Ag. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 31]
机译:使用Te-125-Mossbauer光谱来研究Cu-Ag-As-Se玻璃的局部硫属元素环境的变化,该变化显示出Ag +离子传输的异常。这些具有恒定银含量15 at。%和可变铜浓度x的离子导电玻璃在以下条件下(i)显着降低了Ag-110示踪剂扩散系数D-Ag的数量级,即降低了两个数量级:小于或等于x小于或等于10,并且(ii)在小于或等于x小于或等于20的10处恢复几乎完全的D-Ag。D-Ag的抛物线形状伴随有一个四极分裂QS具有相似的成分依赖性,反映了Te-M(M = Ag,Cu)和Se-Ag原子间距离的变化。 x = 10 at。%Cu时最小的硫属元素-银的距离对应于D-Ag的最小值。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:31]

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