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Coupling Coefficients and Elastic Constants of Caesium Halides
Author(s) -
Sharan B.,
Tiwari L. M.
Publication year - 1964
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.19640070105
Subject(s) - caesium , brillouin zone , coupling constant , halide , coupling (piping) , compressibility , physics , thermodynamics , chemistry , atomic physics , quantum mechanics , materials science , inorganic chemistry , metallurgy
Following Kellermann, the Brillouin zone of caesium chloride is divided into 10 × 10 × 10 equal regions. The coupling coefficients are calculated for 56 non‐equivalent points including the origin of the Brillouin zone, a correct enumeration of which points yields a total of 1,000 wave vectors or 12,000 coupling coefficients. Reststrahlen frequency is used in preference to compressibility in the evaluation of the constants of the repulsive part. A relation between the elastic constants and the second order coupling coefficients different from that of K ELLERMANN is used, and within the limitations of the model, the agreement between theory and experiment for the elastic constants is reasonable, and is very good for the compressiblility.