VAPOR PRESSURE OF ALKALI METALS. RUBIDIUM, CESIUM, AND SODIUM-POTASSIUM ALLOY (NaK) UP TO 100 PSI
The vapor pressures of high-purity cesium, rubidium, and NaK (sodium-- potassium alloy) of 30.6 wt % sodium were measured from roughly 1 to 100 lb psi abs. The method employed boiling under argon, in a small capsule to ensure temperature uniformity. Recent independert results by others on sodium, in close agreement with earlier sodium data obtained with the apparatus, demonstrated its reliability. Its reproducibility was also demonstrated by the close agreement of results with two different charges of cesium, and by the low standard errors of the data. The vapor pressures of cesium and rubidium were found to be about 20% higher than the values recently computed by others, and up to about 10% higher than results reported in larger boilers from other laboratories. The corrected normal boiling points for the pure metals were found to be: Cs, 666.25 deg C; Rb, 685.73 deg C. The vapor pressure of NaK was found to agree with Raoult's Law, well within experimental uncertainties. Analysis indicated that log P versus l/T fitted the vapor pressure data very well over the experimertal range, and that an additional log T term was not justifiable statistically. (auth)
- Research Organization:
- Columbia Univ., New York
- NSA Number:
- NSA-17-004947
- OSTI ID:
- 4769667
- Journal Information:
- Am. Soc. Metals, Trans. Quart., Journal Name: Am. Soc. Metals, Trans. Quart. Vol. Vol: 55
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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