Hysteretically reversible phase transition in a molecular glass - Archive ouverte HAL
Article Dans Une Revue The Journal of Chemical Physics Année : 2012

Hysteretically reversible phase transition in a molecular glass

Résumé

Pressure induced densification in a molecular arsenic sulfide glass is studied at ambient temperature using x-ray scattering, absorption and Raman spectroscopic techniques in situ in a diamond anvil cell. The relatively abrupt changes in the position of the first sharp diffraction peak, FSDP, and the pressure-volume equation of state near ∼2 GPa suggest a phase transition between low- and high-density amorphous phases characterized by different densification mechanisms and rates. Raman spectroscopic results provide clear evidence that the phase transition corresponds to a topological transformation between a low-density molecular structure and a high-density network structure via opening of the constituent As4S3 cage molecules and bond switching. Pressure induced mode softening of the high density phase suggests a low dimensional nature of the network. The phase transformation is hysteretically reversible, and therefore, reminiscent of a first-order phase transition.
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Dates et versions

hal-04548884 , version 1 (16-04-2024)

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Bora Kalkan, Camille Sonneville, C. Martinet, Bernard Champagnon, B. Aitken, et al.. Hysteretically reversible phase transition in a molecular glass. The Journal of Chemical Physics, 2012, 137 (22), pp.224503. ⟨10.1063/1.4769794⟩. ⟨hal-04548884⟩
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