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Thermally stimulated depolarization currents in OH − ‐doped NaCl and KCl crystals
Author(s) -
Suszyńska M.,
Capelletti R.
Publication year - 1988
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170230213
Subject(s) - doping , halide , impurity , dielectric , alkali metal , divalent , polarization (electrochemistry) , conductivity , depolarization , electrical resistivity and conductivity , chemistry , ion , analytical chemistry (journal) , dislocation , materials science , condensed matter physics , inorganic chemistry , crystallography , physics , optoelectronics , medicine , organic chemistry , endocrinology , chromatography , quantum mechanics
The main features of the high‐temperature ITC band are analyzed on the basis of experimental results obtained for NaCl and KCl crystals containing the hydroxyl ions. The unusual behaviour of this band has been compared with that described previously for alkali halides, AH, (LiF, NaCl, KCl) doped with some divalent cations, Me ++ , (Be, Eu, Ni, Pb). It has been shown that — similar to the case of the Me ++ ‐doping‐most of the results obtained can be explained in frames of the Maxwell‐Wagner‐Sillars model of interfacial polarization induced by the impurities forming the charge clouds to the dislocation lines. An ITC band can be detected due to the fact that these regions exhibit electric conductivity and dielectric constants different from those characteristic of the bulk material. The role of the charge of dislocations in the induced polarization phenomenon is shortly discussed.