Abstract
Semiconducting chalcogenide glasses generally exhibit a series of well defined multiphonon absorption peaks in the frequency region between about 400 and 4000 cm−1. Measurements of the frequency and temperature dependences of the one-phonon and multiphonon spectra in crystalline and glassy As2S3 and glassy GeS2 are compared with the predictions of a model calculation in which the anharmonic effects are approximated by a Morse potential. These calculations indicate that anharmonic contributions caused by nonlinearities in the dipole moment are significant in some chalcogenide glasses.
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References
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The width of the impurity mode near 500 cm−1 narrows up at 80K, but the total oscillator strength remains constant. The net effect of superimposing this behavior on a slowly varying two-phonon contribution, as given by the lower dashed curve of Figure 2, is to generate the curve given by the solid line of Figure 2.
This sample was kindly supplied by C. T. Moynihan.
R. E. Howard and C. T. Moynihan, private communication.
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Crystalline As2S3 is a highly anisotropic compound whose local structural order consists of AsS3 pyramidal units linked together in a layered configuration. X-ray scattering results unambiguously confirm the existence of AsS3 pyramids in the glass but are unable to confirm or deny definitely the existence of layer segments in the glass. See the conflicting interpretations in: S. Tsuchihashi and Y. Kawamoto, J. NonCryst. Solids 5, 286 (1971)
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See for example L. Pauling, The Nature of the Chemical Bond (Cornell Univ. Press, 1960).
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© 1975 Plenum Press, New York
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Treacy, D., Taylor, P.C. (1975). Multiphonon Absorption in the Chalcogenide Glasses As2S3 and GeS2 . In: Mitra, S.S., Bendow, B. (eds) Optical Properties of Highly Transparent Solids. Optical Physics and Engineering. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-2178-1_21
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DOI: https://doi.org/10.1007/978-1-4684-2178-1_21
Publisher Name: Springer, Boston, MA
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