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A Relation Between Fast and Slow Motions in Glassy and Liquid Selenium

U. Buchenau and R. Zorn

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Atomic mean-square displacements for frequencies above 1011 Hz have been determined from neutron time-of-flight data in the glassy, liquid and crystalline phase of selenium. As in many other substances, the difference between the values in the disordered and the ordered phase shows a strong increase with increasing temperature, setting in at about the glass temperature. The inverse of that difference turns out to be linearly related to the logarithm of the viscosity. The relation holds from below the glass transition temperature up to above the melting temperature, covering twenty decades in the viscosity.


PACS

64.70.Pf Glass transitions

66.20.+d Viscosity of liquids; diffusive momentum transport

63.50.+x Vibrational states in disordered systems

Subjects

Soft matter, liquids and polymers

Condensed matter: structural, mechanical & thermal

Dates

Issue 6 (15 March 1992)

Received 24 June 1991



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