Osmium diboride, an ultra-incompressible, hard material

Robert W. Cumberland, Michelle B. Weinberger, John J. Gilman, Simon M. Clark, Sarah H. Tolbert*, Richard B. Kaner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

375 Citations (Scopus)


The need for wear- and scratch-resistant materials drives the quest for new superhard materials. In this work, we apply two design parameters to identify ultra-incompressible, superhard materialshigh valence electron density and high bond covalency. Our first example of such a material is OsB2. The bulk modulus of OsB2 was measured using in situ high-pressure X-ray diffraction and was determined to be in the range of 365-395 GPa. While this value is slightly less than that of the bulk modulus of diamond, due to the anisotropic crystal structure of OsB2, the axis compressibility in the orthorhombic c-direction is less than the axis compressibility found in diamond. OsB2 also scratches the surface of a sapphire window, indicating that the hardness of OsB2 exceeds 2000 kg/mm2.

Original languageEnglish
Pages (from-to)7264-7265
Number of pages2
JournalJournal of the American Chemical Society
Issue number20
Publication statusPublished - 25 May 2005
Externally publishedYes

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