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Osmium borides : ウィキペディア英語版 | Osmium borides
Osmium borides are compounds of osmium and boron. Their most remarkable property is potentially high hardness. It is thought that a combination of high electron density of osmium with the strength of boron-osmium covalent bonds will make osmium borides superhard materials. This has not been demonstrated yet. For example, OsB2 is hard (hardness comparable to that of sapphire), but not superhard. ==Synthesis== Osmium borides are produced in vacuum or inert atmosphere to prevent formation of osmium tetroxide, which is a hazardous compound. Synthesis occurs at high temperatures (~1000 °C) from a mixture of MgB2 and OsCl3.〔
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