Phonon Dispersion, Thermal Expansion and the Melting Curves of Inert Gas Solids

1974 ◽  
Author(s):  
K. V. Namjoshi ◽  
S. S. Mitra ◽  
J. F. Vetelino
Keyword(s):  
Thermal Expansion ◽  
Phonon Dispersion ◽  
Inert Gas ◽  
Melting Curves

scholarly journals Low-temperature thermal expansion of pure and inert-gas-doped fullerite C60

2003 ◽  
Vol 29 (4) ◽  
pp. 324-332 ◽  
Author(s):  
A. N. Aleksandrovskii ◽  
A. V. Dolbin ◽  
V. B. Esel’son ◽  
V. G. Gavrilko ◽  
V. G. Manzhelii ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Low Temperature ◽  
Inert Gas

Thermal expansion of inert gas solids in the harmonic approximation

1964 ◽  
Vol 10 (1) ◽  
pp. 69-70 ◽  
Author(s):  
J.W. Leech ◽  
C.J. Peachey ◽  
J.A. Reissland
Keyword(s):  
Thermal Expansion ◽  
Harmonic Approximation ◽  
Inert Gas

The application of the analytic embedded atom method to bcc metals and alloys

1992 ◽  
Vol 7 (3) ◽  
pp. 639-652 ◽  
Author(s):  
A.M. Guellil ◽  
J.B. Adams
Keyword(s):  
Thermal Expansion ◽  
Predictive Power ◽  
Phonon Dispersion ◽  
Embedded Atom Method ◽  
Phonon Dispersion Curves ◽  
Fcc Metals ◽  
Surface Energies ◽  
Bcc Metals ◽  
Embedded Atom ◽  
And Migration

Johnson and Oh have recently developed Embedded Atom Method potentials for bcc metals (Na, Li, K, V, Nb, Ta, Mo, W, Fe). The predictive power of these potentials was first tested by calculating vacancy formation and migration energies. Due to the results of these calculations, some of the functions were slightly modified to improve their fit to vacancy properties. The modified potentials were then used to calculate phonon dispersion curves, surface relaxations, surface energies, and thermal expansion. In addition, Johnson's alloy model, which works well for fcc metals, was applied to the bcc metals to predict dilute heats of solution.

Lattice dynamics of zinc chalcogenides under compression: Phonon dispersion, mode Grüneisen, and thermal expansion

1981 ◽  
Vol 24 (2) ◽  
pp. 741-753 ◽  
Author(s):  
D. N. Talwar ◽  
M. Vandevyver ◽  
K. Kunc ◽  
M. Zigone
Keyword(s):  
Thermal Expansion ◽  
Lattice Dynamics ◽  
Phonon Dispersion

Intrinsically Localized Modes in Uranium and the Prospect for Finding them in Plutonium

2008 ◽  
Vol 1104 ◽  
Author(s):  
Michael Manley
Keyword(s):  
Thermal Expansion ◽  
Phonon Dispersion ◽  
Thermal Excitation ◽  
Momentum Dependence ◽  
X Rays ◽  
Localized Modes ◽  
Nonlinear Localization ◽  
Level Model ◽  
Energy And Momentum ◽  
Two Level Model

AbstractDynamic nonlinear localization, an emerging new area of materials physics, has the potential to fundamentally change our understanding of materials properties. These intrinsically localized modes (ILM) have been found forming in uranium above about 450 K. Comparisons with data from the literature shows that these ILMs influence many properties, including heat capacity, thermal transport, thermal expansion, and mechanical deformation. The existence of ILMs helps to explain many anomalies in uranium, some of which have been known for more than fifty years. Here, the possibility that ILMs may also play a role in the properties of plutonium is considered. The mechanism helps to explain the success of an “Invar-like” two-level model for the thermal expansion of Pu without the need to invoke local magnetic states, which have been ruled out experimentally. It also helps to explain an excitation observed in δ-plutonium that has energy consistent with the two-level model, but momentum dependence consistent with lattice vibrations. This excitation, energy and momentum dependence, is consistent with the non-equilibrium generation of ILMs and the thermal excitation properties of these ILMs are consistent with a two-level model. High-temperature inelastic x-rays scattering measurements of the phonon dispersion curves of δ-plutonium are needed to test this hypothesis.

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