Calculation of thermodynamic properties of metastable phases of the elements |
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Authors: | J Kouvetakis and L Brewer |
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Affiliation: | (1) Department of Chemistry, Arizona State University, 85287 Tempe, AZ;(2) Department of Chemistry, University of California, 94720 Berkeley, CA;(3) Materials Sciences Division, Lawrence Berkeley Laboratory, 94720 Berkeley, CA |
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Abstract: | A chemical bonding model that provides a method of predicting thermodynamic properties of metastable structures of the solid
elements is presented. The method involves a Born-Haber-type cycle to calculate the difference in bonding energies between
the room temperature stable structures and metastable structures. To carry out the calculations, spectroscopic data are used
to determine the promotion energies from the ground state of the gaseous atom to the valence state corresponding to each structure.
Such data are available for most elements, but in cases where experimental data are lacking, they are derived using predictive
models. Combinations of promotion energies and heats of sublimation are used to determine bonding enthalpies. The contribution
of the outer-shell s and p-electrons and the inner-shell d and f electrons to the bonding energies are considered taking into
account the crystal field effect upon the bonding abilities of different d and f orbitals
This paper was presented at the Thermodynamics and Phase Equilibria of Metastable Phases Symposium at the Spring TMS Meeting,
March 1-4, 1992, in San Diego.
The symposium was organized by Philip Nash, Illinois Institute of Technology, and Ricardo Schwarz,Los Alamos National Laboratory. |
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