The crystal structure of Bi4O5I2 and its relation to the structure of Bi4O5Br2

E. Keller; V. Krämer; M. Schmidt; H. Oppermann

doi:10.1524/zkri.217.6.256.22811

Published by De Gruyter (O) September 25, 2009

The crystal structure of Bi₄O₅I₂ and its relation to the structure of Bi₄O₅Br₂

E. Keller , V. Krämer , M. Schmidt and H. Oppermann

From the journal Zeitschrift für Kristallographie - Crystalline Materials

https://doi.org/10.1524/zkri.217.6.256.22811

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Abstract

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 P2₁ (no. 4), Z=4, a=14.944(1), b=5.6983(3), c=11.263(1) Å, β= 99.81(1)°. 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, I). A structural reason for the deviation of the twin supercells of the two compounds from orthogonality is discussed.

Published Online: 2009-9-25

Published in Print: 2002-6-1

The crystal structure of Bi₄O₅I₂ and its relation to the structure of Bi₄O₅Br₂

Abstract

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