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The OCN − vibrational spectrum and the phase transitions in KCN x KCl 1− x single crystals
Author(s) -
Castro J. C.,
de Souza M.
Publication year - 1978
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.2220860115
Subject(s) - orthorhombic crystal system , phase transition , crystallography , single crystal , phase (matter) , crystal (programming language) , chemistry , materials science , crystal structure , analytical chemistry (journal) , condensed matter physics , physics , organic chemistry , chromatography , computer science , programming language
The OCN − bending mode and Fermi resonances are studied in pure KCN and in mixed KCN x KCl 1− x crystals. The two phase transitions in these salts are followed as a function of the Cl − concentration. By the application of uniaxial stress in the mixed crystals almost single domain regions are formed that allow to verify that the CN − and OCN − alignment in the orthorhombic phase is along the (110) direction. These single domain regions keep their alignment without applied stress by temperatures below the cubic orthorhombic phase transition. No change in dichroism is found in cooling the crystal to very low temperatures.