Experiments on expanded liquid metals at high temperatures

The electrical resistivity of liquid tungsten was measured using electric pulse healing of the wires inside capillary tubes. Under "fast" heating (10 mu s) or "slow" heating (50 mu s), the wire expands and fills the inner cavity of the capillary. On the oscillogram traces of the voltage drop across the wire, one can see the phases solid, liquid, fast expansion, and then the moment when the cavity is filled with the metal. Using the voltage drop, current, and volume of the capillary cavity, one can calculate the electrical resistivity, rho, of the expanded metal. Tungsten densities from 7.5 to 1 g . cm(-3)(3 x 10(22) to 0.5 x 10(22) atoms . cm(-3)) were investigated at temperatures from 10 x 10(3) to 14 x 10(3) K. For these densities, the electrical resistivity increased from 0.5 to 5m Omega . cm.