A structural study of Li2S---B2S3 glasses by neutron diffraction
A structural study of Li2S---B2S3 glasses by neutron diffraction
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Li2S---B2S3玻璃的中子衍射结构研究
DOI：
10.1016/0022-3093(94)90034-5
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发表时间：
1994
影响因子：
3.5
通讯作者：
S. Elliott
中科院分区：
文献类型：
--
作者：
C. Estournès;A. Owens;M. Ménétrier;A. Levasseur;K. Rao;S. Elliott
用中子衍射实验测定了五种Li_2S·（1-x）B_2S_3玻璃（x= 0.55，0.60，0.67，0.71，0.75）的径向分布函数（RDFs）。这些玻璃是通过在受控气氛手套箱内铸造硼、硫和Li 2S的熔融混合物来制备的。发现添加Li 2S改性剂逐渐抑制对应于原子间距离> 3.5 μ m的所有峰，这意味着这些玻璃中存在的结构实体变得分段，因此随着x的增加，离子性更强。基于四配位和三配位硼（后者携带桥接和/或非桥接硫）存在四个主要结构实体的假设解释了RDF中存在的所有峰作为组成的函数。此外，在大多数改性的玻璃（x= 0.75）中，只包含“孤立的”BS 3 − 3三角形，似乎有证据表明Li+与S−离子的八面体或四面体配位。
The radial distribution functions (RDFs) of fivexLi2S·(1−x)B2S3glasses (x= 0.55, 0.60, 0.67, 0.71 and 0.75) have been determined from neutron diffraction experiments performed at the Institut Laue-Langevin, Grenoble. These glasses are prepared by casting a molten mixture of boron, sulphur and Li2S inside a controlled atmosphere glovebox. Addition of the Li2S modifier is found gradually to suppress all peaks corresponding to interatomic distances > 3.5 Å, which implies that the structural entities present in these glasses become segmented, and therefore more ionic, asxincreases. The assumption of the existence of four main structural entities based on four- and three-coordinated borons (the latter carrying bridging and/or non-bridging sulphurs) accounts for all the peaks present in the RDFs as a function of composition. Furthermore, in the most modified glass (x= 0.75), that which contains only ‘isolated’ BS3−3triangles, there seems to be evidence for either octahedral or tetrahedral coordination of Li+by S−ions.