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Dielectric Properties of Interstitial Impurity Cations in Alkali Halide Crystals
Author(s) -
Lal K.
Publication year - 1967
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19670220116
Subject(s) - impurity , vacancy defect , halide , alkali metal , nearest neighbour , dipole , condensed matter physics , divalent , lattice (music) , chemistry , materials science , crystallography , inorganic chemistry , physics , acoustics , organic chemistry , artificial intelligence , computer science
The dielectric behaviour of an interstitial divalent impurity cation associated with cation vacancies in alkali halide crystals is investigated. Two cases are considered: In the first case the two cation vacancies are assumed to be at the nearest neighbour positions. In the second case the impurity is assumed to be attached to one vacancy at a second nearest neighbour position. The impurity‐vacancy dipoles show relaxational losses, which reach a maximum at 4 ω 1 in the first case and at ω 1 in the second case. Here ω 1 , is the jump frequency of the vacancy between lattice sites. The maximum values of the loss tangent are calculated for the two cases and compared with that obtained for the case of a substitutional impurity associated with one vacancy at a nearest neighbour position.