Ionic conduction pathways in noble metal chalcohalide glasses

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• 作者：Takeshi Usuki ; Kohei Nakajima ; Takaaki Furukawa ; Yohei Onodera ; Toshio Nasu ; Masaki Sakurai and Shinji Kohara
• 关键词：Chalcohalide glasses ; High energy X-ray diffraction ; Neutron diffraction ; EXAFS
• 刊名：Solid State Ionics
• 出版年：2006
• 出版时间：31 October 2006
• 年：2006
• 卷：177
• 期：26-32
• 页码：2581-2584
• 全文大小：248 K

文摘

High-energy X-ray diffraction, neutron diffraction and extended X-ray absorption fine structure experiments have been carried out for (MI)_x(As₂Se₃)_1−x glasses (M: Ag or Cu). The addition of a large amount of MI does not significantly affect short-range orderings of the host network matrix. The interatomic distance of M–I pairs is very similar to the case of crystalline MI. However, the coordination number of M–I pairs in the present glasses seems to be somewhat smaller than that in the crystalline MI, suggesting a heavy distortion of tetrahedral coordinates of MI units or structural disorder of the I–I sub-cages in the glass state. It would be predictable that the structure model for MI–As₂Se₃ glasses is proposed to be a pseudobinary mixture of the As(Se_1/2)₃ network matrix and MI-related conduction pathways.