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Science 7 December 2007:
Vol. 318. no. 5856, p. 1549
DOI: 10.1126/science.318.5856.1549a
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Letters
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Technical Comment Abstracts
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COMMENT ON "Synthesis of Ultra-Incompressible Superhard Rhenium Diboride at Ambient Pressure"
Natalia Dubrovinskaia, Leonid Dubrovinsky, Vladimir L. Solozhenko
Abstract: Chung et al. (Reports, 20 April 2007, p. 436) reported the synthesis of superhard rhenium diboride (ReB2) at ambient pressure. We show that ReB2, first synthesized at ambient pressure 45 years ago, is not a superhard material. Together with the high cost of Re, this makes the prospect for large-scale industrial applications of ReB2 doubtful.
Full text at www.sciencemag.org/cgi/content/full/318/5856/1550c
RESPONSE TO COMMENTS ON "Synthesis of Ultra-Incompressible Superhard Rhenium Diboride at Ambient Pressure"
Hsiu-Ying Chung, Michelle B. Weinberger, Jonathan B. Levine, Robert W. Cumberland, Abby Kavner, Jenn-Ming Yang, Sarah H. Tolbert, Richard B. Kaner
Abstract: 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.
Full text at www.sciencemag.org/cgi/content/full/318/5856/1550d
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