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A model of selenium is discussed in which it is proposed that a crystal is formed on continuous chains of atoms which zigzag so as to fill a volume which is large compared with the lattice spacing. It is assumed that the charge carriers (holes) move freely along these chains but that transitions between chains are difficult. This predicts the right dependence of conductivity on frequency and a mobility rising with temperature but the magnitude of the resistivity is not explained since this requires a detailed discussion of the transition process. Some related properties are discussed.
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R. A. Hyman (1956) studied this question.
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