Sound Velocity in Liquid and Glassy Selenium

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dc.creatorPayne, W. B.
dc.creatorOlson, J. K.
dc.creatorAllen, A.
dc.creatorKozhevnikov, V. F.
dc.creatorTaylor, P. C.
dc.date2004-08-19
dc.date.accessioned2026-07-07T02:59:50Z
dc.date.available2026-07-07T02:59:50Z
dc.descriptionThe speed of longitudinal sound waves at 7 and 22 MHz has been measured in liquid, supecooled, and amorphous selenium, including the region around the glass transition temperature, Tg, near 35 C. In amorphous selenium the speed of shear waves at 7 MHz was also measured. The experiments were performed with high purity Se (99.9999%) hermetically sealed in an evacuated quartz ampoule. Four temperature regions with strongly different relaxation times can be distinguished between room temperature and the melting point: (1) a glassy state below Tg, which is stable on the time scale of the experiments, (2) a glassy state above Tg,, which is metastable on the time scale of the experiments, (3) a region where homogeneous crystal nucleation occurs, and (4) a supercooled liquid, which is stable on the time scale of the experiments. Each region is marked by a change in the slope of the temperature dependence of the sound velocity. Near the glass transition temperature the velocities of longitudinal and transverse sound exhibit hysteresis with a step-like drop on heating and a more continuous rise on cooling. The step-like anomaly in sound velocity may be a general property of the glass transition.
dc.description10 pages, 5 figures, reported at 12th International Conference on Liquid and Amorphous Metals (LAM 12), Metz, July 2004
dc.identifierhttps://arxiv.org/abs/cond-mat/0408425
dc.identifierhttp://arxiv.org/abs/cond-mat/0408425
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24671
dc.subjectDisordered Systems and Neural Networks
dc.subjectMaterials Science
dc.titleSound Velocity in Liquid and Glassy Selenium
dc.typetext

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