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An LCAO technique has been used for calculating the band structures of the hexaborides of Ca, Sr, Ba and La. The first three of these are shown to have small band gaps. The stability of the metal hexaborides and the B 6 sublattice is discussed and it is shown that electron density accumulates inside each cage. The metallic conductivity of LaB 6 is explained and the Hall coefficient for this substance is calculated.
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Perkins et al. (1975) studied this question.
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