Is Rhenium Diboride a Superhard Material?

  title={Is Rhenium Diboride a Superhard Material?},
  author={Jiaqian Qin and Duanwei He and Jianghua Wang and Leiming Fang and Li Lei and Yongjun Li and Juan Hu and Zili Kou and Yan Bi},
  journal={Advanced Materials},
  • J. QinD. He Yan Bi
  • Published 17 December 2008
  • Materials Science
  • Advanced Materials
Superhard materials are usually composed of light elementssuch as boron, carbon, nitrogen, and oxygen. These lightelemental atoms have the ability to form covalently bonded,three-dimensional networks of high atomic density withextreme resistance to external shear. Most researchers agreeonthedefinitionaccordingtowhich‘‘superhard’’materialsarethosewithVickershardness(Hv)higherthan40GPa 

Ultrastrong Boron Frameworks in ZrB12: A Highway for Electron Conducting

ZrB12, with a high symmetrical cubic structure, possesses both high hardness and ultralow electrical resistivity and is associated with the extended BB 3D covalent bonding network as it is not only favorable for achieving high hardness, but also provides conducting channels for transporting electrons.

Structure–Property Relationships in Novel High Pressure Superhard Materials

Research on novel high-pressure superhard materials (those approaching diamond and cubic boron nitride in hardness) is driven by both scientific and practical objectives: the desire to understand

Unusual rigidity and ideal strength of CrB4 and MnB4

By means of first-principles calculations, we report superior rigidity, ideal tensile, and shear strength for orthorhombic CrB4 and MnB4. The analysis of microscopic deformation mechanism reveals

An ultra-incompressible ternary transition metal carbide

The ternary transition metal carbide Mo0.5W0.5C was synthesized under high pressure and high temperature and the crystalline structure was confirmed by Rietveld refinements as being hexagonal (Pm2).

Revealing unusual rigid diamond net analogues in superhard titanium carbides

Transition metal carbides (TMCs) are considered to be potential superhard materials and have attracted much attention. With respect to titanium and carbon atoms, we confirm the pressure-composition

A metallic carbon allotrope with superhardness: a first-principles prediction

Carbon has abundant allotropes with superhardness, but few of them are metallic. From first-principles calculations, we propose a stable metallic carbon allotrope (Hex-C24) phase with superhardness.

Exploring the effects of interlamellar binding modes on the hardness of ReB2 and MoB2 with laminar structure

The properties of structure, elasticity, and electron for ReB2 and MoB2 are investigated, using first-principles calculations, as well as the role of chemical bonds between metal layer and boron



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

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

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

The synthesis of superhard rhenium diboride (ReB2) at ambient pressure is shown to be not a superhard material, and the prospect for large-scale industrial applications of ReB2 doubtful.

Osmium diboride, an ultra-incompressible, hard material.

In this work, two design parameters are applied to identify ultra-incompressible, superhard materials-high valence electron density and high bond covalency and the first example of such a material is OsB2.

B6O‐Based Composite to Rival Polycrystalline Cubic Boron Nitride

A one-step sintering process is developed to prepare nanostructured super-hard B6O-B4C compacts (see figure) from a mixture of B, B2O3, and B4C precursors at a mild pressure of similar to 3GPa and

Synthesis and Design of Superhard Materials

▪ Abstract The synthesis of the two currently used superhard materials, diamond and cubic boron nitride, is briefly described with indications of the factors influencing the quality of the crystals

Synthesis of superhard cubic BC2N

Cubic BC2N was synthesized from graphite-like BC2N at pressures above 18 GPa and temperatures higher than 2200 K. The lattice parameter of c-BC2N at ambient conditions is 3.642(2) A, which is larger

Boron suboxide: As hard as cubic boron nitride

The Vickers hardness of boron suboxide single crystals was measured using a diamond indentation method. Under a loading force of 0.98 N, our test gave an average Vickers hardness of 45 GPa. The

Synthesis of Ultra-Incompressible Superhard Rhenium Diboride at Ambient Pressure

Rhenium diboride (ReB2), synthesized in bulk quantities via arc-melting under ambient pressure, rivals materials produced with high-pressure methods in properties and may find applications in cutting when the formation of carbides prevents the use of traditional materials such as diamond.