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Melting curves of molecular hydrogen and molecular deuterium under high pressures between 20 and 373 K

V. DiatschenkoDepartment of Physics and Energy Laboratory, University of HoustonUniversity Park, Houston, Texas 77004C. W. ChuDepartment of Physics and Energy Laboratory, University of HoustonUniversity Park, Houston, Texas 77004D. H. LiebenbergDepartment of Physics and Energy Laboratory, University of HoustonUniversity Park, Houston, Texas 77004David A. YoungDepartment of Physics and Energy Laboratory, University of HoustonUniversity Park, Houston, Texas 77004M. RossDepartment of Physics and Energy Laboratory, University of HoustonUniversity Park, Houston, Texas 77004R. L. MillsDepartment of Physics and Energy Laboratory, University of HoustonUniversity Park, Houston, Texas 77004

1985en

ABI

Annotatsiya

We determined the melting curve of molecular hydrogen and molecular deuterium at closely spaced intervals from 20 to 373 K by two different techniques using high-pressure diamond cells. The cells were loaded with liquid at low temperature or with compressed gas at room temperature. Empirical functions for the melting curves were evaluated from least-squares fits of the data. Values of the compressibility and Debye temperature were computed at melting, and the results are compared with those calculated from various theoretical models. The good agreement shows that the models are generally valid, although small systematic deviations may point the way toward refinements in modeling. Our study also demonstrates the need to determine a one-piece intermolecular potential valid over a wide pressure range by refitting all experimental data, including the shock data recently made available.

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DOI: 10.1103/physrevb.32.381

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