Structural studies of glassy and crystalline selenium-sulphur compounds
X-ray diffraction studies revealed that the compositional dependence of the glassy structure of the binary selenium-sulphur system conforms to and can be explained by structure variations in corresponding crystalline compounds. For up to ∼28% S, sulphur atoms are accommodated in the structure based on the selenium matrix and distorting it. As the percentage of sulphur reaches 50%, complete phase transitions take place. The discontinuity observed in the lattice parameters of crystalline selenium-sulphur compounds is interpreted in terms of the interatomic and inter-molecular forces. The crystallization process of the sample SSe20 was studied, where sulphur clusters were likely to be formed during the growth of selenium crystals, but sulphur atoms were accommodated in the fully crystalline selenium matrix so that no sulphur phase was formed.
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