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Ultrasonic Velocity and Attenuation in Alkali Halides Containing CN − I. Experimental Results
Author(s) -
Byer N. E.,
Sack H. S.
Publication year - 1968
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.19680300218
Subject(s) - halide , alkali metal , chemistry , relaxation (psychology) , ultrasonic sensor , attenuation , dipole , analytical chemistry (journal) , quantum tunnelling , molecular physics , condensed matter physics , inorganic chemistry , physics , optics , organic chemistry , acoustics , psychology , social psychology , chromatography
The ultrasonic velocity and attenuation were measured in KCl, KBr, KI, and NaCl containing CN − as a function of acoustic mode, temperature, concentration, frequency, plastic deformation, and static bias stress. The results are not compatible with stress ordering of an elastic dipole tensor represented by an ellipsoid of rotation with CN − axes having 〈100〉 equilibrium positions, as had been inferred from other measurements. A thermally activated relaxation peak was observed for a CN − dimer with a barrier height of 0.008 eV. In NaCl the CN − reorients by thermal activation over a 0.035 eV barrier as opposed to the tunneling in the potassium halides.