Lech AT1, Turner CL1, Mohammadi R2, Tolbert SH3, Kaner RB4.
Proc Natl Acad Sci U S A. 2015 Mar 17;112(11):3223-8. doi: 10.1073/pnas.1415018112. Epub 2015 Mar 2.Superhard metals are of interest as possible replacements with enhanced properties over the metal carbides commonly used in cutting, drilling, and wear-resistant tooling. Of the superhard metals, the highest boride of tungsten--often referred to as WB4 and sometimes as W(1-x)B3--is one of the most promising candidates. The structure of this boride, however, has never been fully resolved, despite the fact that it was discovered in 1961--a fact that severely limits our understanding of its structure-property relationships and has generated increasing controversy in the literature. Read More