Abstract
Low temperature specific heat measurements on a single crystal of trigonal Se result in a Debye temperature Θ D = 186 K. This unexpected high value will be compared with the elastic Debye temperature which has been calculated from a set of the elastic constants Cik for trigonal Se. Recommended values for Cik at 300 K and 0 K, respectively, have been calculated from a review of recent measurements of the ultrasound velocities, the piezoelectric effect and the phonon dispersion curves for trigonal Se and Te. For Te the calculated elastic Θ D is in good agreement with the specific heat data, whereas for Se the calculation results in a too small value. This discrepancy will be discussed with regard to the influence of the piezoelectric effect on the acoustic phonons propagating in piezoactive directions.
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Meißner, M., Mimkes, J. (1979). Low Temperature Specific Heat and Elastic Constants of Trigonal Selenium. In: Gerlach, E., Grosse, P. (eds) The Physics of Selenium and Tellurium. Springer Series in Solid-State Sciences, vol 13. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81398-6_12
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DOI: https://doi.org/10.1007/978-3-642-81398-6_12
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