Abstract
Differential thermal analysis results on Bi x Se 1− x alloys (0 < x < 0.27) show that Bi atoms may be either three- or four-fold coordinated. Further measurements of dark conductivity show a sharp decrease of both resistivity and activation energy of conductivity between 1 and 2 at% of Bi. Comparison with other Bi-based alloys and chalcogenide alloys without Bi leads to the conclusion that Bi plays a particular role when allied with chalcogen materials. Considerations on the metallic character and electronegativity of Bi enable us to confirm that in Bi-based chalcogen alloys the Bi defects are four-fold coordinated and positively charged.
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