Abstract
Abstract The density gradient correction to kinetic energy (nine times smaller than the original von Weizsacker correction) has been used within local density formalism to calculate the cold compression curve of metals. Numerical results are reported for Li, Be, Al and Cu. The modifications to the Thomas-Fermi-Dirac (TFD) results strongly depend, in the low compression range ( ϱ / ϱ 0 ⩽ 5), on the electron density of the material. The relative difference between the pressures in the present model and the TFD model regularly decreases with increasing compression, suggesting that TFD is reliable for ϱ / ϱ 0 ⩾ 50 in Li, ϱϱ 0 ⩾ 20 in Be and Al and ϱ / ϱ 0 ⩾ 10 in Cu.
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