Abstract
The temperature dependence of the partial pressure of H 2O(g) above the Li 2O(s)-LiOH(s, l) system was determined for temperatures between 300 and 617°C. The partial pressures were measured by means of a flowing gas technique combined with continuous monitoring of the concentration of water vapor in a helium carrier gas. For the reaction LiOH(s) = Li 2O(s) + H 2O(g) , second law heat and entropy of reaction values of ΔH o = 30.7 ± 0.6 kcal/mol and ΔS o = 29.5 ± 1.0 cal/mol.K were obtained. Above the melting point of LiOH (744 K), these values were ΔH o =19.9 ± 0.6 kcal/mol and ΔS o =14.8 ± 0.8 cal/mol.K . Current measurements yield ΔH m o = 5.4 ± 0.4 kcal/mol for the heat of melting of LiOH, which is in good agreement with the JANAF recommended value of 4.99 kcal/mol. The results of these measurements can be used to partially describe the behavior of a Li 2O solid breeding blanket in anticipated fusion reactor environments.
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