学術雑誌論文

学術雑誌論文

text

Nature Communications. 2013, 4, p. 2343

Observation of higher stiffness in nanopolycrystal diamond than monocrystal diamond

Springer Nature

英語

text

2013-08-12

https://doi.org/10.1038/ncomms3343

Tanigaki K., Ogi H., Sumiya H., et al. "Observation of higher stiffness in nanopolycrystal diamond than monocrystal diamond", Nature Communications, 4, 2343 (2013). https://doi.org/10.1038/ncomms3343.

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. © 2013 Macmillan Publishers Limited. All rights reserved.

84476

Observation of higher stiffness in nanopolycrystal diamond than monocrystal diamond

Springer Nature

英語

2013-08-12

Nature Communications

4

2343

https://doi.org/10.1038/ncomms3343

https://hdl.handle.net/11094/84476