Densities, molar volumes, and surface tensions of Na-K-Cs ternary alloys along the two sections containing the eutectic alloy
The densities, molar volumes, and surface tensions of 21 ternary alloys of the Na-K-Cs system have been determined in the temperature range 293–453 K for the two sections directed to the Cs and K vertices and containing the eutectic alloy. The polytherms of these parameters for the Na0.129K0.435Cs0.436 eutectic alloy in the temperature range 200–460 K are described by linear equations and their values at 373 K are determined to be 1406 kg m−3, 54.62 × 10−6 m3 mol−1, and 77.0 mN m−1, respectively. The isotherms of molar volumes of the ternary alloys in both sections obey the additivity rule; in the low-concentration range, cesium exhibits high surface activity.