New contender for second-hardest material in the world.
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References
He, D. et al. Boron suboxide: as hard as cubic boron nitride. Applied Physics Letters 81, 643 - 645 (2002).
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Ball, P. Tough competition. Nature (2002). https://doi.org/10.1038/news020722-1
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DOI: https://doi.org/10.1038/news020722-1