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Application of [Lambda] to the fourth perturbation theory in calculating the equation of state of rare gas solids and fcc metals

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dc.contributor.author Shanes, Fredrick C. en_US
dc.date.accessioned 2009-07-09T17:31:28Z
dc.date.available 2009-07-09T17:31:28Z
dc.date.issued 1984-07-09T17:31:28Z
dc.identifier.uri http://hdl.handle.net/10464/1755
dc.description.abstract We have calculated the thermodynamic properties of monatomic fcc crystals from the high temperature limit of the Helmholtz free energy. This equation of state included the static and vibrational energy components. The latter contribution was calculated to order A4 of perturbation theory, for a range of crystal volumes, in which a nearest neighbour central force model was used. We have calculated the lattice constant, the coefficient of volume expansion, the specific heat at constant volume and at constant pressure, the adiabatic and the isothermal bulk modulus, and the Gruneisen parameter, for two of the rare gas solids, Xe and Kr, and for the fcc metals Cu, Ag, Au, Al, and Pb. The LennardJones and the Morse potential were each used to represent the atomic interactions for the rare gas solids, and only the Morse potential was used for the fcc metals. The thermodynamic properties obtained from the A4 equation of state with the Lennard-Jones potential, seem to be in reasonable agreement with experiment for temperatures up to about threequarters of the melting temperature. However, for the higher temperatures, the results are less than satisfactory. For Xe and Kr, the thermodynamic properties calculated from the A2 equation of state with the Morse potential, are qualitatively similar to the A 2 results obtained with the Lennard-Jones potential, however, the properties obtained from the A4 equation of state are in good agreement with experiment, since the contribution from the A4 terms seem to be small. The lattice contribution to the thermal properties of the fcc metals was calculated from the A4 equation of state, and these results produced a slight improvement over the properties calculated from the A2 equation of state. In order to compare the calculated specific heats and bulk moduli results with experiment~ the electronic contribution to thermal properties was taken into account~ by using the free electron model. We found that the results varied significantly with the value chosen for the number of free electrons per atom. en_US
dc.language.iso eng en_US
dc.publisher Brock University en_US
dc.subject Perturbation (Mathematics) en_US
dc.subject Gases, Rare. en_US
dc.subject Solids. en_US
dc.subject Metals--Analysis. en_US
dc.title Application of [Lambda] to the fourth perturbation theory in calculating the equation of state of rare gas solids and fcc metals en_US
dc.type Electronic Thesis or Dissertation en_US
dc.degree.name M.Sc. Physics en_US
dc.degree.level Masters en_US
dc.contributor.department Department of Physics en_US
dc.degree.discipline Faculty of Mathematics and Science en_US


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