Technical Comments

Response to Comment on "Synthesis of Ultra-Incompressible Superhard Rhenium Diboride at Ambient Pressure"

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Science  07 Dec 2007:
Vol. 318, Issue 5856, pp. 1550
DOI: 10.1126/science.1147704

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Dubrovinskaia et al. question our demonstration that rhenium diboride (ReB2) is hard enough to scratch diamond. Here, we provide conclusive evidence of a scratch through atomic force microscopy depth profiling and elemental mapping. With high hardness, high-bulk modulus, and the ability to withstand extreme differential stress, ReB2 and related materials should be investigated regardless of their cost, which is not prohibitive.

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