硼化锇
硼化锇是锇和硼的化合物。它们最显着的特性是潜在的高硬度。人们认为锇的高电子密度和硼-锇共价键的强度会使锇硼化物成为超硬材料，但这仍未得到证实。例如，OsB2很坚硬（硬度与蓝宝石相若），但不足以称得上超硬材料。[1]
合成
[编辑]硼化锇在真空或惰性环境中制备，以防止危险的四氧化锇形成。硼化锇在高温（~1000 °C）下由MgB2和OsCl3的混合物合成。[1]
结构
[编辑]已知至少有三种硼化锇：OsB、Os2B3和OsB2。前两者具有六边形结构，[2]类似于二硼化铼。二硼化锇最初也被认为具有六方的，[3]但它的一个相后来被重新分配为正交相。[1][4]在近期合成方法中，发现Os2的六方相具有与ReB2相似的结构。[5]
参考文献
[编辑]- ^ 1.0 1.1 1.2 Cumberland, Robert W.; et al. Osmium Diboride, An Ultra-Incompressible, Hard Material. Journal of the American Chemical Society. April 27, 2005, 127 (20): 7264–5. PMID 15898746. doi:10.1021/ja043806y.
- ^ M. Hebbache; et al. A new superhard material: Osmium diboride OsB2. Solid State Communications. 2006, 139 (5): 227–231. Bibcode:2006SSCom.139..227H. doi:10.1016/j.ssc.2006.05.041.
- ^ Kempter, C. P.; Fries, R. J. Crystallography of the Ru-B and Os-B Systems. The Journal of Chemical Physics. 1961, 34 (6): 1994. Bibcode:1961JChPh..34.1994K. doi:10.1063/1.1731807.
- ^ Roof, R. B.; Kempter, C. P. New Orthorhombic Phase in the Ru-B and Os-B Systems. The Journal of Chemical Physics. 1962, 37 (7): 1473. Bibcode:1962JChPh..37.1473R. doi:10.1063/1.1733309.
- ^ Xie, Zhilin; Blair, Richard G.; Orlovskaya, Nina; Cullen, David A.; Andrew Payzant, E. Thermal stability of hexagonal OsB2. Journal of Solid State Chemistry. 2014-11-01, 219: 210–219. Bibcode:2014JSSCh.219..210X. doi:10.1016/j.jssc.2014.07.035.
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