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Effect of anharmonicity on the K ≈ 0 modes of MgO and ZnS
Author(s) -
Srivastava S. P.,
Singh R. D.
Publication year - 1971
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.2220450110
Subject(s) - anharmonicity , ionic bonding , dielectric , lattice vibration , materials science , condensed matter physics , spectral line , compressibility , lattice (music) , phonon , physics , thermodynamics , quantum mechanics , ion , optoelectronics , acoustics
Experimental investigations are made of the infrared transmission spectra of MgO and ZnS in the region of the fundamental lattice absorption at room temperature. The magnitude of the effect of anharmonicity has been calculated and discussed in the light of symmetry of spectra at the resonance frequencies. The effective ionic charge and compressibility of Szigeti's relations are calculated and the significance of these results is discussed from the point of view of various models of dielectric behaviour.