Correlating structure with non-linear optical properties in xAs40Se60·(1-x)As40S60 glasses.
Correlating structure with non-linear optical properties in xAs40Se60·(1-x)As40S60 glasses.
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DOI：
10.1039/c4cp05599c
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
E. Barney;N. Abdel-Moneim;J. J. Towey-J.;J. Titman;J. Mccarthy;H. Bookey;A. Kar;D. Furniss;A. Seddon
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文献类型：
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作者：
E. Barney;N. Abdel-Moneim;J. J. Towey-J.;J. Titman;J. Mccarthy;H. Bookey;A. Kar;D. Furniss;A. Seddon
用中子和X射线全散射、拉曼光谱和（77）Se MAS-NMR研究了一系列xAs_（40）Se_（60）·（100 - x）As_（40）S_（60）玻璃，其中x = 0，25，33，50，67，75和100 mol% As_（40）Se_（60）。测量的非线性折射率，n2，和密度的结果。没有证据表明在这些玻璃中形成的单极键，但中子相关函数表明，有一个非随机分布的硫和硒原子在富硫玻璃。在含有<50摩尔% As 40 Se 60的玻璃中，与硒原子距离3-4埃处的硫原子的平均数nSeS偏离随x的线性变化;这些玻璃的n2也随x非线性变化。重要的是，n2和nSeS的直接比较给出了线性相关性，表明n2可能与玻璃中硫族元素原子的分布有关。
A series of xAs40Se60·(100 - x)As40S60 glasses, where x = 0, 25, 33, 50, 67, 75 and 100 mol% As40Se60, has been studied using neutron and X-ray total scattering, Raman spectroscopy and (77)Se MAS-NMR. The results are presented with measurements of non-linear refractive indices, n2, and densities. There is no evidence for the formation of homopolar bonds in these glasses, but neutron correlation functions suggest that there is a non-random distribution of sulfur and selenium atoms in sulfur-rich glasses. The average number of sulfur atoms at a distance of 3-4 Å from a selenium atom, nSeS, deviates from a linear variation with x in glasses containing <50 mol% As40Se60; n2 for these glasses also varies non-linearly with x. Importantly, a direct comparison of n2 and nSeS gives a linear correlation, suggesting that n2 may be related to the distribution of chalcogen atoms in the glasses.