Abstract
Crystals of Ba 5Fe 5− x Pt x ClO 13 and Ba 5Co 5− y Pt y ClO 13 were prepared for x=1.31, 1.51, 1.57, 1.59 and y=0, 0.97 and 1.08 in a BaCl 2 flux and investigated by X-ray diffraction methods. These compounds adopt a 10H perovskite structure built from the stacking of BaO 3 and BaOCl layers in the sequence (BaO 3) 4(BaOCl) with space group P6 3/ mmc. The cation sites within the trimeric unit of face-sharing octahedra are occupied by Co or Fe and Pt ions, while the tetrahedral sites formed between BaO 3 and BaOCl layers are only occupied by Fe or Co. Moreover, oxygen stoichiometry indicates an average oxidation state for Co and Fe higher than +III, indicating the stabilization of Co 4+ and Fe 4+.
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