Raman and infrared spectra of As2Sx chalcogenide glasses with x ? 3 |
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Authors: | A Bertoluzza C Fagnano P Monti G Semerano |
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Institution: | Centro Studi per la Spettroscopia Raman, Istituto Chimico “G. Ciamician”, Bologna, Italy |
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Abstract: | Raman laser and far infrared spectra of As2Sx glasses with x ? 3 are given and discussed. The purpose of the work is to bring a vibrational spectroscopic contribution to the study of these glasses and to the hypothesis, still under discussion in the literature, that they might be constituted either by a homogeneous vitreous phase or by a mixture of As2S3 and As4S4.Our results confirm a phase separation, with formation of ß-As4S4, below a certain value of x, which depends not only on the preparation method of the samples but also on other factors such as melting time. Laser irradiation of ß-As4S4 modifies its Raman spectrum. Such a phenomenon is attributable to two principal factors, either a partial polymerization or formation of a species richer in arsenic. A structural and formation model of the As2Sx glasses is given, starting from a more generalized structural model of vitreous As2S3 which is an accord with the vibrational results and those by the diffraction method in the literature. |
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