Rhenium diboride

Rhenium diboride (ReB2) is a synthetic high-hardness material that was first synthesized in 1962. The compound is formed from a mixture of rhenium, noted for its resistance to high pressure, and boron, which forms short, strong covalent bonds with rhenium. It has regained popularity in recent times in hopes of finding a material that possesses hardness comparable to that of diamond.

Rhenium diboride
Names
IUPAC name
Rhenium diboride
Identifiers
3D model (JSmol)
EC Number
  • 234-959-3
  • InChI=1S/2B.Re
    Key: OLXPHXSOQYDZNT-UHFFFAOYSA-N
  • B#[Re]#B
Properties
ReB2
Molar mass 207.83 g/mol
Appearance black powder
Density 12.7 g/cm3
Melting point 2,400 °C (4,350 °F; 2,670 K)
none
Structure
Hexagonal, Space group P63/mmc.
Hazards
GHS labelling:
Warning
H315, H319, H335
P261, P280, P304+P340, P305+P351+P338, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Unlike other high-hardness synthetic materials, such as the c-BN, rhenium diboride can be synthesized at ambient pressure, potentially simplifying a mass production. However, the high cost of rhenium and commercial availability of alternatives such as polycrystalline c-BN, make a prospect of large-scale applications less likely.

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