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Contribution from the Lattice Vibrational Term and Pressure Dependence of the Phase Diagrams for Alkali Alloys
Author(s) -
Soma T.,
Iwafune K.,
Kagaya H.Matsuo
Publication year - 1987
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221430210
Subject(s) - alkali metal , helmholtz free energy , phase diagram , thermodynamics , lattice (music) , condensed matter physics , internal energy , materials science , chemistry , phase (matter) , physics , organic chemistry , acoustics
The lattice vibrational contributions to the internal energy and Helmholtz free energy of alkali metals such as K, Rb, and Cs are studied in the dynamical treatment using the previously developed electronic theory based on pseudopotentials. The pressure effect on the phase diagrams of the CsK, CsRb, and RbK systems are obtained quantitatively considering lattice vibrational contributions. A region of phase mixture is decreased under pressure, and the melting curves under compression show an increase in temperature.