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Abstract

The growing technological importance of alkali metals, mainly due to their specific advantages for high temperature application (section 3), has resulted in an increased demand for a reliable and consistent set of thermodynamic data. The rapidly increasing fuel costs and need for improved thermal efficiency of power plants consequently led to an increase in the peak temperatures of the cycles (chapter 3.1). The resulting necessity for safety risk assessment led to considerable efforts to extend our knowledge up to and even beyond their critical point temperatures. In chapter 6.1 the measured melting, boiling and critical point data of the alkali metals are reviewed. The melting point temperatures are well established. Deviation within a degree or less are mainly due to the impurity content of the sample. Because of the somewhat large scatter in boiling temperatures, the selected values are compared to the boiling point temperatures taken from assessed vapour pressure curves presented in chapter 6.2. Main emphasis has been given to the assessment of the critical point data where only a few direct measurements compare to a large number of predicted values (chapter 2.5.1). The main experimental methods for measurements in the critical region are described. For lithium no measurements in the critical region are available. The various estimates of the critical temperature differ by over a thousand degrees and range from 3000 - 4000 K (chapter 2.5.1). For sodium, only recently was a second set of measurements in the critical region reported. Uncertainties on the exact location of the critical point still remain for potassium, rubidium and cesium. In particular, recent improvements indicate a critical temperature for Cs lower than the published values.

Additional information

Authors: OHSE R W, JRC KARLSRUHE ESTAB. (GERMANY);ARGONNE NATIONAL LABORATORY, ARGONNE, ILLINOIS (USA);BABELOT J F, JRC KARLSRUHE ESTAB. (GERMANY);ARGONNE NATIONAL LABORATORY, ARGONNE, ILLINOIS (USA);MAGILL J, JRC KARLSRUHE ESTAB. (GERMANY);ARGONNE NATIONAL LABORATORY, ARGONNE, ILLINOIS (USA);TETENBAUM M JRC KARLSRUHE ESTAB. (GERMANY), JRC KARLSRUHE ESTAB. (GERMANY);ARGONNE NATIONAL LABORATORY, ARGONNE, ILLINOIS (USA);ARGONNE NATIONAL LABORATORY, ARGONNE, ILLINOIS (USA), JRC KARLSRUHE ESTAB. (GERMANY);ARGONNE NATIONAL LABORATORY, ARGONNE, ILLINOIS (USA)
Bibliographic Reference: PUBLISHED IN HANDBOOK OF THERMODYNAMIC AND TRANSPORT PROPERTIES OF ALKALI METALS, 1985, CHAPTER 6.1, PP. 329 - 347.
Record Number: 1989124085800 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en