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/content/aip/journal/adva/2/1/10.1063/1.3696721
2012-03-12
2016-12-06

Abstract

Tungsten tetraboride (WB4) is experimentally considered as potentially superhard material and is therefore expected to have highly structural stability and enhanced resistance against plastic deformation and failure. The examinations of bond-deformation mechanism suggest a significantly soft bond-deformation pattern induced by ionic W-B bonding for nominal WB4 in experiments, largely responsible for the limitation of its strength and structural integrity. Computations on the structures and mechanical properties for WB4 show a novel thermodynamically favored MoB4-type phase with excellent mechanical properties and remarkable incompressibility along c direction. The illustrations of nonstoichiometry and x-ray diffraction spectra rationalize the experimental observation of nominal composition WB4 as defective tungstenborides (W1-x B3 (x<0.25) or WB4-x (x>0.25)). The results provide new insight into the real structural and mechanical properties of tungstenborides.

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