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The dependence of the phonon spectrum of a crystal and the associated therm
odynamic functions on electron temperature in the absence of equilibrium be
tween the electrons and the lattice is investigated. The treatment is perfo
rmed within the Thomas-Fermi approximation for a body-centered cubic crysta
l at high pressures. (C) 1999 American Institute of Physics. [S1063-7761(99
)02001-6].