The crystal structure of Bi<sub>4</sub>O<sub>5</sub>I<sub>2</sub> and its relation to the structure of Bi<sub>4</sub>O<sub>5</sub>Br<sub>2</sub>
- Keller, E.
- Kramer, V.
- Schmidt, M.
- Oppermann, H.
DOIAbstract
The crystal structure of Bi4O5I2 has been solved from a 3: 1 twinned crystal; accurate lattice parameters have been determined by a Rietveld refinement. Bi4O5I2 crystallizes with space group P2(1) (no.4), Z = 4, a = 14.944(1), b = 5.6983(3), c = 11.263(1) Angstrom, beta = 99.81(1)degrees. Its structure is isotypic to the structure of the homologous Bi4O5Br2 for which more reliable lattice parameters have been determined by a Rietveld refinement. The effects of replacement of Br by I on the structure are discussed and compared with corresponding effects in the BiOX family (X = Cl, Br, 1). A structural reason for the deviation of the twin supercells of the two compounds from orthogonality is discussed
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