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Tantalum boride : ウィキペディア英語版 | Tantalum boride
Tantalum borides are compounds of tantalum and boron most remarkable for their extreme hardness. ==Properties== The Vickers hardness of TaB and TaB2 films and crystals is ~30 GPa.〔〔〔 Those materials are stable to oxidation below 700 °C and to acid corrosion.〔〔 TaB2 has the same hexagonal structure as most diborides (AlB2, MgB2, etc.).〔X. Chen et al. "Electronic and Structural Origin of Ultraincompressibility of 5d Transition-Metal Diborides" (Phys. Rev. Lett. 100 (2008) 196403 )〕 The mentioned borides have the following space groups: TaB (orthorhombic, Thallium(I) iodide-type, Cmcm), Ta5B6 (Cmmm), Ta3B4 (Immm), TaB2 (hexagonal, aluminum diboride-type, P6/mmm).〔
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