The pseudobinary systems ACl−FeCl3 (A=Na, K, Rb, Cs) were reinvestigated by means of differential thermal analysis and X-ray powder diffraction. The existence of the compounds AFeCl4 (A=Na−Cs) and Cs3Fe2Cl9 could be confirmed; Cs3Fe2Cl9 is a stable compound which decomposes to CsCl and CsFeCl4 above 270°C. Additionally, two Rb-compounds—Rb3FeCl6 and Rb3Fe2Cl9—were found, which decompose, when heated, in the solid state. Rb3Fe2Cl9 is isotypic with the analogous Cs-compound; Rb3FeCl6 has the Cs3BiCl6 structure. Cs3FeCl6 is isotypic with Cs3CrCl6, a recently found orthorhombic variant of the elpasolite type.
|Journal of Thermal Analysis and Calorimetry|
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