Abstract
Arising from N. Dubrovinskaia & L. Dubrovinsky Nature502,http://dx.doi.org/10.1038/nature12620(2013)
Dubrovinskaia and Dubrovinsky1 question the sub-grain structure and ultrahigh hardness of our nanotwinned cubic boron nitride (nt-cBN; ref. 2), and make the following assertions: (1) hardening related to nanotwinning in cBN has been known for tens of years, (2) our X-ray diffraction (XRD) and Raman results do not show the signatures of nanotwinning, (3) there are large wurtzite-structure boron nitride (wBN) domains present in our samples, and (4) our hardness values are unconvincing. We argue below that all these claims are incorrect.
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References
Dubrovinskaia, N. & Dubrovinsky, L. Controversy about ultrahard nanotwinned cBN. Nature 502, http://dx.doi.org/10.1038/nature12620 (2013)
Tian, Y. et al. Ultrahard nanotwinned cubic boron nitride. Nature 493, 385–388 (2013)
Dubrovinskaia, N. et al. Superhard nanocomposite of dense polymorphs of boron nitride: noncarbon material has reached diamond hardness. Appl. Phys. Lett. 90, 101912 (2007)
Corrigan, F. R. & Bundy, F. P. Direct transitions among the allotropic forms of boron nitride at high pressures and temperatures. J. Chem. Phys. 63, 3812–3820 (1975)
Horiuchi, S., He, L.-L., Huang, J., Taniguchi, T. & Akaishi, M. Development of superhard materials using HRTEM. J. Surf. Anal. 3, 197–202 (1997)
Nix, W. D. & Gao, H. Indentation size effects in crystalline materials: a law for strain gradient plasticity. J. Mech. Phys. Solids 46, 411–425 (1998)
Chaudhri, M. M. & Lim, Y. Y. Harder than diamond? Just fiction. Nature Mater. 4, 4 (2005)
Brazhkin, V. et al. What does ‘harder than diamond’ mean? Nature Mater. 3, 576–577 (2004)
Luo, X. et al. Compressive strength of diamond from first-principles calculation. J. Phys. Chem. C 114, 17851–17853 (2010)
Roundy, D. & Cohen, M. L. Ideal strength of diamond, Si, and Ge. Phys. Rev. B 64, 212103 (2001)
Pan, Z., Sun, H., Zhang, Y. & Chen, C. Harder than diamond: superior indentation strength of wurtzite BN and lonsdaleite. Phys. Rev. Lett. 102, 055503 (2009)
Yan, C. S. et al. Ultrahard diamond single crystals from chemical vapor deposition. Phys. Status Solidi A 201, R25–R27 (2004)
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Tian, Y., Xu, B., Yu, D. et al. Tian et al. reply. Nature 502, E2–E3 (2013). https://doi.org/10.1038/nature12621
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DOI: https://doi.org/10.1038/nature12621
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