Structure of Amorphous Selenium
Structure of Amorphous Selenium
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无定形硒的结构
DOI：
10.1143/jjap.37.2590
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发表时间：
1998
影响因子：
1.5
通讯作者：
Shiro Kodera Shiro Kodera
中科院分区：
文献类型：
--
作者：
Yukitaka Kobashi Yukitaka Kobashi;Shiro Kodera Shiro Kodera
用X射线衍射研究了熔融硒在620 K至室温急冷后的非晶硒的结构。单色化Ag Kα射线的衍射强度为s=22.0 <$-1。计算了晶型间间距为0.1 μ m的相邻原子的平均配位数，并与观测到的径向分布曲线进行了比较。还计算了这些结构的理论衍射强度。通过与观测数据的比较，可以在假设样品中的应变分布为高斯分布，原子间距离的标准偏差与其平均距离成线性比例，并且链间（或-环）原子的标准偏差大于链内（或-环）原子的标准偏差的基础上估计网格参数。β-单斜结构最符合所获得的数据。
The structure of amorphous selenium prepared by quenching from molten selenium at 620 K to room temperature has been studied by X-ray diffraction. The diffraction intensity of monochromatized Ag Kα radiation was determined to be s=22.0 Å-1. The mean coordination numbers of neighbouring atoms with an interval of 0.1 Å at the distances of the crystalline forms were calculated and compared with the observed radial distribution curves. Theoretical diffraction intensities were also calculated for these structures. By comparison with the observed data, the mesh parameters could be estimated on the assumption that the strain distributions in the sample are Gaussian and the standard deviations of interatomic distances are linearly proportional to their mean distances and are larger for interchain (or -ring) atoms than for intrachain (or -ring) atoms. The β-monoclinic structure best fitted the obtained data.