Observation of polyamorphism in the phase change alloy Ge 1Sb 2Te 4

B. Kalkan*, S. Sen, J. Y. Cho, Y. C. Joo, S. M. Clark

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    A high-pressure synchrotron x-ray diffraction study of the phase change alloy Ge 1Sb 2Te 4 demonstrates the existence of a polyamorphic phase transition between the as deposited low density amorphous (LDA) phase and a high density amorphous (HDA) phase at ∼10 GPa. The entropy of the HDA phase is expected to be higher than that of the LDA phase resulting in a negative Clapeyron slope for this transition. These phase relations may enable the polyamorphic transition to play a role in the memory and data storage applications.

    Original languageEnglish
    Article number151906
    Pages (from-to)1-5
    Number of pages5
    JournalApplied Physics Letters
    Volume101
    Issue number15
    DOIs
    Publication statusPublished - 8 Oct 2012

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