119Sn Mössbauer studies of glassy and crystalline compounds in the chalcogenide system SeSnAs |
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Authors: | H Cremers BD Mosel W Müller-Warmuth GH Frischat |
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Institution: | Institut für Physikalische Chemie der Universität Münster, Germany;Arbeitsgruppe Glas, Institut für Nichtmetallische Werkstoffe, Technische Universität Clausthal, Germany |
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Abstract: | 119Sn Mössbauer measurements have been carried out on 18 chalcogenide glasses of different composition in the system SeSnAs. In all cases tin is four-coordinated and appears to be tetrahedrally surrounded by selenium. Two of the glasses (Se60Sn3As37 and Se47Sn3As50) were crystallized by heat treatment, and their Mössbauer spectra have been measured as a function of crystallization temperature and annealing time. As a result of the heat treatment, crystalline SnSe and SnSe2 are precipitated. The amount of each compound is determined by the composition of the original glass and the remaining glassy or crystalline phase (As2Se3 and As4Se4). The degree of the crystallization depends on the temperature and the annealing time, but not the mass ratio of the tin selenides formed. |
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