Trichromium Diboride, Cr₃B₂

Trichromium Diboride, Cr₃B₂, was isolated by Jassonneix from an alloy containing 11.6 per cent, of boron. Its chemical properties closely resemble those of the monoboride prepared by this method, but in general it is not so readily attacked; for example, in fluorine it only takes fire when gently heated, and it is not attacked by nitrogen at white heat. Its density at 15° C. is 6.7.