The electronic structure of the borides <i>M</i> B <sub>6</sub>

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<jats:p> The electronic structure of the metallic borides <jats:italic>M</jats:italic> B <jats:sub>6</jats:sub> is investigated theoretically by the tight-binding approximation. The stability of the crystal lattice is interpreted and it is pre­dicted that if <jats:italic>M</jats:italic> is a bivalent metal the crystal should be an insulator or photoconductor, but that if <jats:italic>M</jats:italic> has a valency greater than 2 the crystal should exhibit metallic conductivity. These predictions are consistent with the scanty experimental evidence. </jats:p>

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