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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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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 in Bismuth
IBM Journal of Research and Development, 1964Dispersion curves for phonons propagating in the trigonal direction in bismuth at room temperature and at 75°K have been obtained in a neutron inelastic scattering experiment. Observed frequencies (units 1013 rad/sec) at 75°K are as follows: at the zone center, ωTO = 1.40 ± 0.02, ωLO = 1.89 ± 0.02; at the zone boundary in the trigonal direction, ωTA ...
J. L. Yarnell +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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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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An alternative method for plotting dispersion curves
Ultrasonics, 2009Solving the frequency equation and plotting the dispersion curves in problems of wave propagation in cylinders and plates, particularly when the material is anisotropic, are complicated tasks. The traditional numerical methods are usually based on determination of the zeros of the frequency equation by using an iterative find-root algorithm.
Farhang, Honarvar +2 more
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Migration, unemployment dispersion and the Phillips curve
Regional Science and Urban Economics, 1980Abstract Policy-makers have long known that the complexity of the labor market creates the potential for a wide variety of strategies to be utilized to improve the ‘wage inflation-unemployment’ trade-off. This research assesses the potential effect of two unemployment-reducing strategies — reducing the dispersion of unemployment rates and increasing ...
R E, Azevedo, G E, O'connell
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EXPERIMENTAL DISPERSION CURVES FOR PHONONS IN ALUMINUM
Solid State Communications, 1963Abstract Dispersion curves for phonons propagating in the [100] and [110] directions in an aluminum crystal at ~ 300°K have been measured in a neutron scattering experiment. These data together with the elastic constants obtained by Schmunk and Smith yield dispersion curves having average random errors of ~0·6 per cent, and estimated total errors of ...
John L. Yarnell +2 more
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