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Off‐center Cu + in mixed crystals
Author(s) -
Li M. Siu,
de Souza M.
Publication year - 1979
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.2220920133
Subject(s) - ion , dichroism , crystallography , absorption (acoustics) , degenerate energy levels , analytical chemistry (journal) , crystal (programming language) , chemistry , ionic bonding , center (category theory) , materials science , physics , optics , organic chemistry , chromatography , quantum mechanics , computer science , composite material , programming language
Perturbed off‐centre Cu + ions by Cl − ions in KI and by I − ions in KCl are studied using uniaxial stress induced dichroism on the Cu + uv absorption band and ionic thermocurrent (ITC) technique. Barrier height for the Cu + reorientation is found to have a small decrease as compared with pure KI crystal. The symmetry of the multiwell potential minima changes from 〈111〉 orientation in KI to 〈110〉 in mixed KI + KCl crystals. When I − ions are added to KCl the off‐centre behaviour of the Cu + is found to degenerate in a single deep potential well.