Abstract
The dependence of electric conductivity of pure BETA -rhombohedral boron on temperature and electric fleld intensity is presented. Results are discussed using three models: (I) the Poole-- Frenkel model for an isolated trapping center and for a screened Coulomb center, (II) the hopping models of Mott and Shklovskii, and (In) the small polaron model. Results of electric fleld measurements may be satisfactorily interpreted in both the screened Poole-- Frenkel and the hopping model giving for the dependence of the conductivity sigma on the electric field intensity E the relations ( sigma / sigma /sub 0/)/ sup 1/2/ ln ( sigma / sigma /sub 0/) ~ E and ln ( sigma / sigma /sub 0/) ~ E/sup 1/4/, respectively ( sigma /sub 0/ is the conductivi ty in zero field). The model III alone gives an unreasonable result for the hopping length but nevertheless the essentiality of polaronic effect for BETA -boron seems sufficient from both the expenimental and the theoretical point of view. lt is supposed that the very complex crystal lattice of BETA -rhombohedral boron has a mixed conductivity of a polaron-- Mott type. The magnetoconductivity of boron in the hopping region is also discussed. (auth)
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