Results 241 to 250 of about 607,204 (294)

Phonon dispersion curves of indium

Journal of Physics F: Metal Physics, 1981
Using 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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Interpretation of phonon dispersion curves

Solid State Communications, 1963
Abstract 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 for niobium

Journal of Physics F: Metal Physics, 1980
A 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, 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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Dispersion curve recovery with orthogonal matching pursuit

The Journal of the Acoustical Society of America, 2014
Dispersion 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, 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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