Solubilities of silicon and of germanium in liquid lithium. Lithium–germanium partial phase diagram
- 1 January 1981
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 77 (8) , 1865-1870
- https://doi.org/10.1039/f19817701865
Abstract
The solubilities of silicon (0.00 ⩽xSi⩽ 0.0165) and of germanium (0.00 ⩽xGe⩽ 0.0872) in liquid lithium have been determined by equilibrium resistivity methods and can be represented, in part, by the equations ln xSi= 5.548 – 6775/T 500 ⩽T/K ⩽ 700 ln xGe= 5.459 – 6630/T 530 ⩽T/K ⩽ 715. A thermochemical cycle is used to derive solvation enthalpies (for the neutral gaseous species) for silicon (–557 kJ mol–1) and for germanium (–490 kJ mol–1) in liquid lithium. The compounds Li22Si5 and Li22Ge5 have been shown to precipitate from dilute solutions of silicon and of germanium in liquid lithium, respectively. The melting point of Li22Ge5(934 K) and the lithium-rich eutectic horizontal (453.5 K) of the lithium–germanium system have been established by d.t.a. and t.a. techniques, respectively. These results, together with the solubility data, have been used to augment the lithium–germanium phase diagram (0.00 ⩽xGe⩽ 0.20).Keywords
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