Abstract
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.
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