4.6 Article

The strength of diamond

Journal

APPLIED PHYSICS LETTERS
Volume 87, Issue 14, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.2061853

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Diamond is the hardest known material; however, its mechanical stability, in particular the yield strength sigma(y), is not known. We report reproducible generation of plastic deformation of diamond at room and low temperatures. We determined sigma(y)=130-140 GPa by measuring the pressure distribution over the diamond anvils and by using the theory of elasticity. Yielding in diamond is accompanied by a strong luminescence with a characteristic spectrum. Our findings may be used to extend the static pressure limit beyond the current value of about 300 GPa(3 Megabars). (C) 2005 American Institute of Physics.

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