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Lattice Vibrations and Interatomic Forces in A II B 2 III C 4 VI Defect‐Chalcopyrite Compounds (I) Keating Model Considerations
Author(s) -
Neumann H.
Publication year - 1991
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170260807
Subject(s) - lattice vibration , lattice (music) , chalcopyrite , lattice energy , chemistry , crystallography , crystal structure , semiconductor , inorganic compound , condensed matter physics , atomic physics , physics , phonon , copper , quantum mechanics , organic chemistry , acoustics
The lattice vibrations of the A II B III 2 C VI 4 semiconductors with defect‐chalcopyrite structure are treated in a simplified version of the Keating model considering only interaction with nearest neighbours and assuming that all anions occupy their ideal lattice sites. It is found that in this model the frequencies of the nonpolar and polar modes with highest energy are determined by the properties of the B III –C VI sublattice alone. The frequencies of all the other optical modes depend not only on the A II –C VI and B III –C VI interactions but are also influenced by the presence of the ordered array of vacancies. The results obtained are compared with previous model considerations.