Lattice dynamics and phase diagram of aluminum at high temperatures

Journal Article · Tue Oct 15 04:00:00 EDT 2013 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776113100038· OSTI ID:22210404

Surdin, O. M.; Korshunov, A. S.; Pavlov, V. N. ^[1]; Frolova, N. V.; Kuzin, R. S. ^[2]

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1. National Research Nuclear University 'MEPhI,', Sarov State Institute of Physics and Technology (Russian Federation)
2. Russian Federal Nuclear Center-All-Russian Research Institute of Experimental Physics (Russian Federation)

The dispersion of phonons in the fcc, hcp, and bcc phases of aluminum is calculated at ultrahigh pressures by the method of small displacements in a supercell. The stability of the phonon subsystem is studied. The thermodynamic characteristics are calculated in the quasi-harmonic approximation, and a phase diagram of aluminum is plotted. As compared to the Debye model, the use of a phonon spectrum calculated in the quasi-harmonic approximation significantly broadens the hcp phase field and strongly shifts the phase boundary between the fcc and bcc phases. The normal isentrope is calculated at megabar pressures. It is shown to intersect the fcc-hcp and hcp-bcc phase boundaries. The sound velocity along the normal isentrope is calculated. It is shown to have a nonmonotonic character.

• OSTI ID: 22210404
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 4 Vol. 117; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM
APPROXIMATIONS
BCC LATTICES
COMPARATIVE EVALUATIONS
FCC LATTICES
HCP LATTICES
PHASE DIAGRAMS
PHONONS
SPECTRA
TEMPERATURE RANGE 0400-1000 K
THERMODYNAMIC PROPERTIES