High-pressure structural behaviour of nanocrystalline Ge

Hua Wang, J.F. Liu, Yanwei Wang, Wei Chen, Jianzhong Jiang, J.S. Olsen, Leif Gerward

Research output: Contribution to journalJournal articleResearchpeer-review


The equation of state and the pressure of the I-II transition have been studied for nanocrystalline Ge using synchrotron x-ray diffraction. The bulk modulus and the transition pressure increase with decreasing particle size for both Ge-I and Ge-II, but the percentage volume collapse at the transition remains constant. Simplified models for the high-pressure structural behaviour are presented, based on the assumption that a large fraction of the atoms reside in grain boundary regions of the nanocrystalline material. The interface structure plays a significant role in affecting the transition pressure and the bulk modulus.
Original languageEnglish
JournalJournal of Physics: Condensed Matter
Issue number15
Pages (from-to)156217
Publication statusPublished - 2007

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