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Observation of higher stiffness in nanopolycrystal diamond than monocrystal diamond

Author

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  • Kenichi Tanigaki

    (Graduate School of Engineering Science, Osaka University)

  • Hirotsugu Ogi

    (Graduate School of Engineering Science, Osaka University)

  • Hitoshi Sumiya

    (Advanced Materials R&D Laboratories, Sumitomo Electric Industries, LTD., 1-1-1, Koyakita, Itami, Hyogo 664, Japan)

  • Koichi Kusakabe

    (Graduate School of Engineering Science, Osaka University)

  • Nobutomo Nakamura

    (Graduate School of Engineering Science, Osaka University)

  • Masahiko Hirao

    (Graduate School of Engineering Science, Osaka University)

  • Hassel Ledbetter

    (University of Colorado)

Abstract

Diamond is the stiffest known material. Here we report that nanopolycrystal diamond synthesized by direct-conversion method from graphite is stiffer than natural and synthesized monocrystal diamonds. This observation departs from the usual thinking that nanocrystalline materials are softer than their monocrystals because of a large volume fraction of soft grain-boundary region. The direct conversion causes the nondiffusional phase transformation to cubic diamond, producing many twins inside diamond grains. We give an ab initio-calculation twinned model that confirms the stiffening. We find that shorter interplane bonds along [111] are significantly strengthened near the twinned region, from which the superstiff structure originates. Our discovery provides a novel step forward in the search for superstiff materials.

Suggested Citation

  • Kenichi Tanigaki & Hirotsugu Ogi & Hitoshi Sumiya & Koichi Kusakabe & Nobutomo Nakamura & Masahiko Hirao & Hassel Ledbetter, 2013. "Observation of higher stiffness in nanopolycrystal diamond than monocrystal diamond," Nature Communications, Nature, vol. 4(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3343
    DOI: 10.1038/ncomms3343
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