Results 171 to 180 of about 139,647 (216)
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Interpretation of phonon dispersion curves
Solid State Communications, 1963Abstract The striking fact which has emerged from the experimental studies by neutron spectroscopy of alkali halides, covalent elements, and metals is the existence of long range forces in all three classes of solids. The concept of a force constant has never played a very important part in interpreting the results for alkali halides, since the ...
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Phonon dispersion curves of indium
Journal of Physics F: Metal Physics, 1981Using the modified axially symmetric model with volume forces, the phonon frequencies of indium have been investigated. The lattice structure of indium has been treated as both BCT and FCT in order to avoid the confusion created in the past in understanding the crystallographic equivalence of these two lattices.
V Ramamurthy, S B Rajendraprasad
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Phonon dispersion curves for niobium
Journal of Physics F: Metal Physics, 1980A previously propose phenomenological screened-shell model is extended to include the tangential component of a two-body of between nearest and next-nearest ion-cores and a second-nearest-neighbour radial shell force. The resulting model contains nine parameters, three of which are obtained from the elastic constants, three from the experimental values
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Phonon dispersion curves for niobium
Czechoslovak Journal of Physics, 1984The experimentally measured phonon dispersion relation for niobium is very complex. This complexity may be due to the incomplete electronicd shells which make an important contribution to very large cohesive energy, and its likely effect on the phonon frequencies.
A. R. Jani, V. B. Gohel
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Phonon dispersion curves of Ba0.6K0.4BiO3
Physica C: Superconductivity, 1994Abstract The lattice dynamics of Ba 0.6 K 0.4 BiO 3 was investigated inelastic neutron scattering on a superconducting single crystal (T c =26 K (midpoint)). The results were analysed on the basis of a shell model including free carrier screening and a term to account for a breathing deformability of the BiO 6 octahedra.
M. Braden +3 more
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Phonon dispersion curves for zinc
Journal of Physics C: Solid State Physics, 1969Using a triple-axis neutron spectrometer all branches of the phonon dispersion curves along the three major axes of zinc have been measured. The results for the Δ and Σ axes are in fair agreement with those of previous workers. Results for the T, Tprime axes have not previously been reported.
D L McDonald, M M Elcombe, A W Pryor
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Surface-phonon dispersion curves of TiC(100)
Physical Review B, 1987The surface-phonon dispersion curves of the TiC(100) surface along both the \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{} M\ifmmode\bar\else\textasciimacron\fi{} and \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{} X\ifmmode\bar\else\textasciimacron\fi{} azimuths of the two-dimensional Brillouin zone have been measured by electron ...
, Oshima +7 more
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Phonon dispersion curves for palladium
Journal of Physics F: Metal Physics, 1980A previously proposed six-parameter phenomenological screened shell model is applied to the calculation of the phonon dispersion curves of palladium. The resulting fit, for all symmetric branches except the (111)T, is as good as or better than a seven-parameter calculation using Krebs' model (1965) extended to include two-body forces to third ...
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The splitting of dispersion curves for the fluid-loaded plate
The Journal of the Acoustical Society of America, 1995The splitting of the free-wave dispersion curve for a fluid-loaded plate into sub- and supersonic branches, and the apparent ‘‘repulsion’’ of these two branches, is discussed.
J. Dickey, G. Maidanik, H. Uberall
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Dispersion curve recovery with orthogonal matching pursuit
The Journal of the Acoustical Society of America, 2014Dispersion curves characterize many propagation mediums. When known, many methods use these curves to analyze waves. Yet, in many scenarios, their exact values are unknown due to material and environmental uncertainty. This paper presents a fast implementation of sparse wavenumber analysis, a method for recovering dispersion curves from data.
Joel B, Harley, José M F, Moura
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