Three all-electron calculations of the relative $P(V)$ equation of state (EOS) of LiH and LiD are presented: (1) Hartree-Fock, (2) local density approximation (LDA) using the Ceperley-Alder expression for correlation, and (3) LDA using the Wigner expression for correlation. The results agree within 1% up to 10 GPa with the experimental values, implying that the relative EOS in lithium hydrides depends only weakly on the electronic correlation. The possibility of cancellation of errors with the LDA is discussed.
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Bellaïche et al. (1998) studied this question.
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