Characteristic
Tantalum borides are compounds of tantalum and boron most remarkable for their extreme hardness.
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.). 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).
.jpg "Tantalum Boride (TaB)-Powder")
.jpg "Potassium perruthenate(VII) (RuKO4)-Crystalline")
.jpg "Dititanium Trioxide (Ti2O3)-Pellets")
.jpg "Neodymium Sulfide (Nd2S3)-Powder")
.jpg "Germanium Telluride Lithium (GeTe/Li ( 98/2 mol%))-Sputtering Target")
.jpg "Lanthanum Oxide (La2O3)-Granules")
.jpg "Barium Bromide (BaBr2)-Powder")
