Observation of a Pressure-Induced First-Order Polyamorphic Transition in a Chalcogenide Glass at Ambient Temperature
- 14 July 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 97 (2) , 025504
- https://doi.org/10.1103/physrevlett.97.025504
Abstract
An apparently first-order polyamorphic transition has been observed with increasing pressure at ambient temperature in a molecular glass of composition . Raman spectroscopic measurements on pressure-quenched samples and in situ x-ray diffraction measurements indicate that this transition corresponds to a collapse of the ambient-pressure molecular phase to a high-pressure network phase. The high-pressure phase first appears at a pressure of and the transformation becomes complete at . Calorimetric measurements indicate that the low- and high-pressure phases are thermodynamically distinct and that they coexist in the transition range.
Keywords
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