Hysteretically reversible phase transition in a molecular glass

B. Kalkan*, C. Sonneville, C. Martinet, B. Champagnon, B. G. Aitken, S. M. Clark, S. Sen

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)


    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.

    Original languageEnglish
    Article number224503
    Pages (from-to)2-8
    Number of pages8
    JournalJournal of Chemical Physics
    Issue number22
    Publication statusPublished - 14 Dec 2012


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