THE ELECTRIC-CONDUCTIVITY OF LIQUID CESIUM TO HIGH-TEMPERATURES

An apparatus is used with a thin walled stainless steel cell and a fou r-pole potentiometric arrangement to perform precise measurements of t he electric conductivity sigma of liquid cesium to high temperatures a t equilibrium vapour pressure. Results are given from 200 to 800 degre es C. A five-parameter equation for use from the melting temperature o f 28.4 degrees C to 1200 degrees C is presented. Conductivity values o f 17705 and 6435 ohm(-1) cm(-1) were obtained for 200 and 800 degrees C, respectively. The relative expected error is given in dependence of temperature. A typical value is +/- 0.34%. All data are well within t he range of validity of the near-free-electron, NFE, model for metalli c conductance.