Critical Data of Metals-Estimations for Tungsten

Abstract

Earlier estimations of the critical temperature of tungsten supply two groups of values different from one another by a factor of about 2. By calculating the critical values from a van der Waals-like equation of state modified for metals using Coulomb interaction in the attractive part, the lower temperature (about 12,000 K) has been supported. Besides the other critical parameters, the number of free electrona per atom has been obtained (z _c = 3.14). A scaling of the critical temperature with the plasmon energy also fits numerically, although there is a different dependence upon the electron density.

Key Words:

• Critical temperature
• plasmon energy.