The electrical resistivity, Hall coefficient, thermoelectric power, and magnetic susceptibility of polycrystalline samples of thorium tetraboride and thorium hexaboride have been measured over a range of temperatures. Both compounds exhibit metallic properties. The carrier concentration, about 2 electrons per thorium atom, is that predicted by the bonding model of Lipscomb and Britten.
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Auskern et al. (1968) studied this question.
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