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• W2114548249 abstract "A theoretical melting line is sensitive to a small difference in solid and fluid free energies. Such a difference may arise from different approximations made in fluid and solid theories and also from inaccuracies in handling anharmonic lattice vibrations. Statistical mechanical calculations have been made for liquid and solid 4He and 3He and their melting lines, using a new perturbation theory (PT) which does not suffer from the above limitations. These calculations, which use the Aziz potential for helium, are augmented by additional calculations using quasi-harmonic lattice dynamics and Mansoori—Canfield—Ross theory (with an exponential-6 potential). Comparisons of these results and available Monte Carlo and real experimental data show that the PT can accurately predict solid, fluid, and the melting data of a model of helium (based on the Aziz potential) and that the melting line of real 4He is insensitive to many-body effects up to 200 K, but their influence grows gradually with pressure (≈6% in melting pressure at 300 K). An effective pair potential is suggested which can handle many-body contributions over an extended density range. The calculations on the isotopic pressure shift, δP m = P m(3He)-P m(4He), along the melting lines of helium isotopes show that δP m > 0 at T < 100K in agreement with experiment at T ≈ 30 K and δP m < 0 at T > 100 K in agreement with path integral Monte Carlo data. The PT with the first-order quantum correction was found to explain the experimental melting data surprisingly well; i.e., beyond an estimated range of applicability of the Wigner—Kirkwood expansion. It can imply a rapid convergence of the Wigner—Kirkwood expansion along the melting line of He." @default.
• W2114548249 created "2016-06-24" @default.
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• W2114548249 date "1998-10-10" @default.
• W2114548249 modified "2023-09-27" @default.
• W2114548249 title "A statistical mechanical study on the melting lines of³He and⁴He" @default.
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• W2114548249 doi "https://doi.org/10.1080/00268979809483165" @default.
• W2114548249 hasPublicationYear "1998" @default.
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