Phase-Transition studies of germanium to 1.25 Mbar

Yogesh K. Vohra*, Keith E. Brister, Serge Desgreniers, Arthur L. Ruoff, K. J. Chang, Marvin L. Cohen

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    153 Scopus citations


    New phase transitions in Ge were observed by energy-dispersive x-ray diffraction techniques for pressures up to 125 GPa (1.25 Mbar) as follows: the -Sn structure to the simple hexagonal (sh) phase at 75 ± 3 GPa and to the double hexagonal close-packed structure (dhcp) at 102 ± 5 GPa. These are the highest pressures for which a crystalline structure change has been directly observed by x-ray diffraction. Total-energy pseudopotential calculations predict 84 ± 10 GPa for the -Sn to sh phase transition and 105 ± 2 GPa for sh to hcp (not dhcp) transition. The role of 3 d core electrons in increasing the transformation pressures in Ge, as compared to Si, is emphasized.

    Original languageEnglish (US)
    Pages (from-to)1944-1947
    Number of pages4
    JournalPhysical review letters
    Issue number18
    StatePublished - 1986

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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