MICROSECOND-RESOLUTION MEASUREMENTS OF THE THERMOPHYSICAL PROPERTIES OF LIQUID GOLD

New experimental results obtained using an accurate technique for elec trical and optical measurements on pulse-heated gold samples are given . An almost-constant current pulse is used for resistive self-heating of the sample over a time interval of 50 mus. Because of the high heat ing rate, the sample maintains its cylindrical shape in the liquid pha se. High pressures are used to extend the investigated range of the li quid phase by suppressing boiling. The stability of the liquid sample is demonstrated by short-time photographs, obtained with a kerr-cell c amera. Measurements of current through the sample, voltage drop across the sample, surface radiation, and volume expansion allow the determi nation of the selected thermophysical properties. Specific enthalpy, e lectrical resistivity, temperature, density, and their mutual dependen cies are obtained. In addition, the enthalpy of melting, as well as th e specific heat capacity at constant pressure, is determined.