Results 261 to 270 of about 3,237,360 (342)

Phonon dispersion curves for niobium

Czechoslovak Journal of Physics, 1984
The 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, 1994
Abstract 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, W. Reichardt, A.S. Ivanov, A.Yu. Rumiantsev   +3 more
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Surface-phonon dispersion curves of TiC(100)

Physical Review B, 1987
The 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, , Aizawa, , Wuttig, , Souda, , Otani, , Ishizawa, , Ishida, , Terakura   +7 more
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Phonon Dispersion Curves in Bismuth

IBM Journal of Research and Development, 1964
Dispersion 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, J. L. Warren, R. G. Wenzel, S. H. Koenig   +3 more
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Phonon dispersion curves for zinc

Journal of Physics C: Solid State Physics, 1969
Using 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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An alternative method for plotting dispersion curves

Ultrasonics, 2009
Solving 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, Esmaeil, Enjilela, Anthony N, Sinclair   +2 more
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Migration, unemployment dispersion and the Phillips curve

Regional Science and Urban Economics, 1980
Abstract 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, 1963
Abstract 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, John L. Warren, Seymour H. Koenig   +2 more
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Theoretical Magnon Dispersion Curves for Gd

Physical Review Letters, 1975
The magnon dispersion curve of Gd metal has been determined from first principles by use of augmented-plane-wave energy bands and wave functions. The exchange matrix elements $I(\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}, {\stackrel{\ensuremath{\rightarrow}}{\mathrm{k}}}^{\ensuremath{'}})$ between the $4f$ electrons and the conduction electrons ...
P. -A. Lindgård, B. N. Harmon, A. J. Freeman   +2 more
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Phonon dispersion curves for palladium

Journal of Physics F: Metal Physics, 1980
A 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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