Abstract
Amber-colored single crystals of the quaternary oxide BaKFeO 3 were synthesized from a mixture of Fe 2O 3, KOH and Ba(OH) 2 heated at 750°C for 5 h then cooled slowly. The structure was determined by single-crystal X-ray diffraction (space group Cmca; a=5.804(1) Å, b=11.528(1) Å, c=12.776(1) Å; Z=8, R 1=0.0376, w R 2=0.0996). The structure is comprised of [FeO 3 3−] ∞ chains of corner-sharing iron-oxo tetrahedra that are isolated from one another by interspersed Ba and K cations. The iron coordination environment is moderately distorted from perfect tetrahedral symmetry and the Fe–O–Fe bond angles are 152.8°. Magnetic susceptibility data show a pronounced zero-field cooling effect that suggests strong coupling from 5 K to above room temperature.
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