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Pressure-induced amorphization and an amorphous–amorphous transition in densified porous silicon

Author

Listed:
  • Sudip K. Deb

    (Bhabha Atomic Research Centre)

  • Martin Wilding

    (Thermochemistry Facility, University of California at Davis)

  • Maddury Somayazulu

    (HPCAT, Advanced Photon Source, Argonne National Laboratories)

  • Paul F. McMillan

    (Christopher Ingold Laboratories, University College London
    Davy–Faraday Research Laboratory, Royal Institution of Great Britain)

Abstract

Crystalline and amorphous forms of silicon are the principal materials used for solid-state electronics and photovoltaics technologies. Silicon is therefore a well-studied material, although new structures and properties are still being discovered1,2,3,4. Compression of bulk silicon, which is tetrahedrally coordinated at atmospheric pressure, results in a transition to octahedrally coordinated metallic phases5. In compressed nanocrystalline Si particles, the initial diamond structure persists to higher pressure than for bulk material, before transforming to high-density crystals6. Here we report compression experiments on films of porous Si, which contains nanometre-sized domains of diamond-structured material7,8,9. At pressures larger than 10 GPa we observed pressure-induced amorphization10,11. Furthermore, we find from Raman spectroscopy measurements that the high-density amorphous form obtained by this process transforms to low-density amorphous silicon upon decompression. This amorphous–amorphous transition is remarkably similar to that reported previously for water12,13, which suggests an underlying transition between a high-density and a low-density liquid phase in supercooled Si (refs 10, 14, 15). The Si melting temperature decreases with increasing pressure, and the crystalline semiconductor melts to a metallic liquid with average coordination ∼5 (ref. 16).

Suggested Citation

  • Sudip K. Deb & Martin Wilding & Maddury Somayazulu & Paul F. McMillan, 2001. "Pressure-induced amorphization and an amorphous–amorphous transition in densified porous silicon," Nature, Nature, vol. 414(6863), pages 528-530, November.
  • Handle: RePEc:nat:nature:v:414:y:2001:i:6863:d:10.1038_35107036
    DOI: 10.1038/35107036
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    Cited by:

    1. Zhao Fan & Hajime Tanaka, 2024. "Microscopic mechanisms of pressure-induced amorphous-amorphous transitions and crystallisation in silicon," Nature Communications, Nature, vol. 15(1), pages 1-14, December.

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