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Structure of the Ne-Xe mixture near the 26-MPa demixing curve at T = 275 K

Structure of the Ne-Xe mixture near the 26-MPa demixing curve at T = 275 K We report neutron diffraction measurements for two Ne-Xe mixtures at T = 275 K and P = 26 MPa, having a Xe molar fraction of 0.81 and 0.45, respectively. These thermodynamic points are chosen to be in the single phase region, close to the gas-gas demixing surface. Total structure factors and neutron weighted pair distribution functions have been extracted. Partial pair distribution functions g ij ( r ) have been calculated by means of molecular dynamics simulation using Lennard-Jones interaction potentials and the Lorentz-Berthelot mixing rules, obtaining a good agreement with the experimental data. These partial pair distribution functions have been analyzed in terms of density expansion and also compared with those derived in a previous experiment on a He-Xe mixture. The main difference found between the structural properties of the two mixtures is that, in the Ne containing mixture, a definitely larger fraction of atoms of the lighter species occupies the Xe-Xe first neighbor shell. The model already used in interpreting the thermodynamic behavior of the He-Xe mixture in terms of microscopic properties suggests that this structural difference is related to the different behavior of the pressure-temperature projection of the critical line in the two mixtures. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review E American Physical Society (APS)

Structure of the Ne-Xe mixture near the 26-MPa demixing curve at T = 275 K

Nardone, M; Ricci, F. P
Physical Review E , Volume 54 (6) – Dec 1, 1996
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1996 The American Physical Society
ISSN
1095-3787
DOI
10.1103/PhysRevE.54.6381
Publisher site
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Abstract

We report neutron diffraction measurements for two Ne-Xe mixtures at T = 275 K and P = 26 MPa, having a Xe molar fraction of 0.81 and 0.45, respectively. These thermodynamic points are chosen to be in the single phase region, close to the gas-gas demixing surface. Total structure factors and neutron weighted pair distribution functions have been extracted. Partial pair distribution functions g ij ( r ) have been calculated by means of molecular dynamics simulation using Lennard-Jones interaction potentials and the Lorentz-Berthelot mixing rules, obtaining a good agreement with the experimental data. These partial pair distribution functions have been analyzed in terms of density expansion and also compared with those derived in a previous experiment on a He-Xe mixture. The main difference found between the structural properties of the two mixtures is that, in the Ne containing mixture, a definitely larger fraction of atoms of the lighter species occupies the Xe-Xe first neighbor shell. The model already used in interpreting the thermodynamic behavior of the He-Xe mixture in terms of microscopic properties suggests that this structural difference is related to the different behavior of the pressure-temperature projection of the critical line in the two mixtures.

Journal

Physical Review E – American Physical Society (APS)

Published: Dec 1, 1996

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