scholarly journals Inelastic neutron scattering studies of phonon spectra, and simulations of pressure-induced amorphization in tungstatesAWO4(A=Ba,Sr,Ca, andPb)

2015 ◽  
Vol 91 (9) ◽  
Author(s):  
Prabhatasree Goel ◽  
M. K. Gupta ◽  
R. Mittal ◽  
S. Rols ◽  
S. N. Achary ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Phonon Spectra

Phonon Spectra of Ordered Pdcuh and Pdagh Produced Under a High Hydrogen Pressure

1994 ◽  
Vol 376 ◽  
Author(s):  
A.I. Kolesnikov ◽  
V.E. Antonov ◽  
M. Prager ◽  
S. Bennington ◽  
J. Tomkinson
Keyword(s):  
Neutron Scattering ◽  
Solid Solutions ◽  
Hydrogen Pressure ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Gaseous Hydrogen ◽  
High Hydrogen ◽  
Phonon Spectra ◽  
High Hydrogen Pressure

ABSTRACTAtomically ordered PdAgH and PdCuH hydrides synthesized in an atmosphere of gaseous hydrogen at P = 3 GPa were studied by inelastic neutron scattering. The results showed a large difference between the Pd-H, Ag-H and Cu-H interactions. Values of 93 and 116 meV were predicted for the local H vibrations in dilute Ag-H and Cu-H solid solutions.

NEUTRON SCATTERING STUDIES OF FULLERENES

1992 ◽  
Vol 06 (23n24) ◽  
pp. 4007-4011 ◽  
Author(s):  
KOSMAS PRASSIDES
Keyword(s):  
Neutron Scattering ◽  
Electrostatic Interactions ◽  
Inelastic Neutron Scattering ◽  
High Energy ◽  
Inelastic Neutron ◽  
First Order Phase Transition ◽  
Phonon Spectra ◽  
Wide Range ◽  
Cubic Structure ◽  
First Order Phase

At low temperature, crystalline C 60 adopts a simple cubic structure whose stability is driven by optimisation of the intermolecular electrostatic interactions. Above 85 K, molecular motion is no longer frozen and the molecules shuffle between nearly-degenerate orientations, differing in energy by 11.4(3) meV. At 260 K, a first-order phase transition leads to a face-centred cubic structure, characterised by rapid isotropic molecular reorientational motion. In C 70, orientational ordering occurs near 270 K. The phonon spectra of C 60, superconducting K 3 C 60 and saturation-doped Rb 6 C 60 measured by inelastic neutron scattering in the energy range 0–200meV reveal substantial broadening in the superconducting fulleride of five-fold degenerate H g intramolecular modes both in the low-energy radial and the high-energy tangential part of the spectrum. This confirms the predictions of models based on intramolecular phonon-mediated pairing. The electron-phonon coupling strength is distributed over a wide range of energies (33–195 meV) as a result of the finite curvature of the fullerene spherical cage. No evidence is found for any significant electron-librational coupling.

Anomalous vibrational modes in acetanilide as studied by inelastic neutron scattering

1992 ◽  
Vol 2 (10) ◽  
pp. 1929-1939 ◽  
Author(s):  
Mariette Barthes ◽  
Juegen Eckert ◽  
Susanna W. Johnson ◽  
Jacques Moret ◽  
Basil I. Swanson ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Vibrational Modes

Inelastic neutron scattering study of icosahedral AlFeCu quasicrystal

1992 ◽  
Vol 2 (2) ◽  
pp. 125-130 ◽  
Author(s):  
M. Quilichini ◽  
B. Hennion ◽  
G. Heger ◽  
S. Lefebvre ◽  
A. Quivy
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Scattering Study ◽  
Neutron Scattering Study
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