Abstract
We have grown single crystals of Ba 2Fe 10Sn 2CoO 22 in B 2O 3 flux. This phase is an isomorph of the novel K-type hexagonal ferrite. Using the starting composition we report here, a high yield of single crystals of the title compound is obtained as a unique phase over a wide cooling range. At 120 K the crystal structure has lattice parameters a = 5.9316(7) and c = 14.3128(32) Å, Z = 1, and space group P 3 , although it has a strong P 3m1 pseudosymmetry. The Sn location in the crystal structure is discussed in terms of apparent valences calculated from bond strengths. In addition, the apparent valence provides insight into the Co 2+ location. Our results are compared with those previously obtained by other authors using powdered samples of the same and structurally related compounds. A preliminary magnetic study points to behaviour consistent with that reported previously for polycrystalline samples.
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