Abstract
The phase diagrams of the systems LiBr-MgBr; and LiBr-MnBr; have been studied by high temperature X-ray powder diffraction and differential scanning calorimetry measurements. At elevated temperatures, complete series of solid solutions between NaCl-type LiBr and CdCl 2-type MBr 2 are formed. On cooling to ambient temperature, these solid solutions decompose to LiBr, CdI 2-type MBr 2, and the ternary compounds Li 6MBr 8 (Suzuki type) and Li 2MBr 4 (SnMn 2S 4 type). The structures of the ternary bromides can be characterized by different ordering schemes of the metal ions and vacancies on the octahedral sites of the cubic close-packed bromide ions. The symmetry relations to the aristotype NaCl structure and the Coulomb parts of the cohesive energies are given.
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