Infrared Lattice Vibrations inAlloys
- 16 September 1966
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 149 (2) , 715-729
- https://doi.org/10.1103/physrev.149.715
Abstract
The infrared lattice-vibration spectra of mixed crystals of have been measured by reflection techniques. These crystals exhibit two distinct reststrahlen bands whose strengths and frequencies depend on and which show considerable fine structure. A harmonic model has been developed to account for the significant features of these spectra. The main features of the model are (1) the inclusion of a clustering effect or nonrandom distribution of anions on a microscopic scale, (2) the existence of 5 distinct molecular complexes which leads to 2 groups of 4 closely spaced optical phonon modes, and (3) effective ionic charges that have both local and nonlocal parts. The model provides the frequencies and strengths of the optical phonon modes which with suitably chosen damping constants yield a good fit to the reflectivity spectrum over the entire range of solid solutions.
Keywords
This publication has 13 references indexed in Scilit:
- Vibrations of glass-like disordered chainsProceedings of the Physical Society, 1964
- The vibrations of an atom of different mass in a cubic crystalProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1963
- Theory of Optical Absorption by Vibrations of Defects in SiliconProceedings of the Physical Society, 1963
- Infrared Lattice Bands of QuartzPhysical Review B, 1961
- Vibrational spectra of diatomic chains. IIProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1961
- Infrared Properties of Cubic Silicon Carbide FilmsPhysical Review B, 1959
- Infrared Properties of Hexagonal Silicon CarbidePhysical Review B, 1959
- X-Ray Measurement of Short Range Order in Ag-AuJournal of Applied Physics, 1951
- Interpretation of the Vibration Spectrum of Mix-CrystalsThe Journal of Chemical Physics, 1951
- X-Ray Measurement of Order in Single Crystals of Cu3AuJournal of Applied Physics, 1950