THE PREPARATION AND STRUCTURES OF THE ALKALINE-EARTH IRON OXYHALIDES

The title compounds have been synthesized and crystallized in a variety of structure types. Three of these structure types have been identified via single crystal structure determinations. CaFeO2Cl is monoclinic; space group Am with a = 8.712(5) Å, b = 3.828(1) Å, c = 9.999(4) Å, β = 103.53(4)°, and Z = 4. Ca2FeO3Cl is tetragonal; space group P4 with a = 3.848(2) Å, c = 13.65(1) Å, and Z = 2. Sr3Fe2O5Cl2 is also tetragonal; space group I4/mmm with a = 3.952(1) Å, c = 23.807(3) Å, and Z = 2 . In each of these structures, distinct layers can be identified. Mossbauer measurements of single crystals are presented. © 1991 Academic Press, Inc.