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2005
Equilibria
E 4000
11- 022
Is There a Wurtzite-Modification of Lithium Bromide? — Studies on the System
LiBr/LiI. — Deposition of mixtures of LiBr/LiI and of pure LiI and LiBr from the gas
phase onto a sapphire substrate at -196 °C in a high vacuum chamber is studied by
XRD. Below 0 °C LiI crystallizes in the hexagonal wurtzite-modification (β-LiI) which
transforms into the cubic rock salt modification (α-LiI) by heating up to room temperature. Codepositions of LiBr/LiI results in LiBr1-xIx solid solutions that also crystallize
in the wurtzite-modification below room temperature. Compared to β-LiI, these solid
solutions are more stable and transform into the cubic phase at the significantly higher
temperature of 80 °C. The hexagonal phase LiBr1-x Ix is observed for 0.25 ≤ x ≤ 0.8.
Both cubic phases, α-LiI and LiBr, show solubilities of up to ca. 10% of the respective
other compound. For pure LiBr only the cubic modification is observed in the temperature range from -196 to 25 °C. — (FISCHER, D.; MUELLER, A.; JANSEN*, M.;
Z. Anorg. Allg. Chem. 630 (2004) 15, 2697-2700; MPI Festkoerperforsch.,
D-70569 Stuttgart, Germany; Ger., Abstr. Eng.) — Schramke
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