Electronic structure and bulk properties of MB6 and MB12 borides

Электpонные свойства металлов и сплавов

Анотація

Ab initio band structure calculations have been carried out for higher boridesMB₆ and MB₁₂. High precision measurements of the elastic constants were performed for ZrB₁₂, HoB₁₂, ErB₁₂, TmB₁₂, LuB₁₂, YB₆ and LaB₆ compounds at low temperatures. The bulk properties of the borides have been analyzed on the basis of the calculated equations of states and balanced crystal orbital overlap populations. Our calculations indicate that hexaborides with divalent metals, CaB₆, SrB₆, BaB₆, and YbB₆, are semiconductors with small energy gaps. The metallic MB₆ hexaborides with trivalent M atoms are found to possess larger bulk moduli values. For dodecaborides bulk moduli are found to be higher for MB₁₂ with increased filling of the conduction band (ZrB₁₂, HfB₁₂, UB₁₂), comparatively to M³⁺B₁₂ compounds. The total energy calculations for different magnetic configurations in YbB₁₂ point to a possibility of antiferromagnetic coupling between Yb³⁺ ions.