MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Chlorine Occupancy Dependence of Crystal Structure of Pure β-Phase of Iron-Oxyhydroxide
Junko TakagiMasataka OzakiKazuhiro ShigemasaTadashi Mizoguchi
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2010 Volume 51 Issue 7 Pages 1330-1339

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Abstract

Crystal structure of β-phase of iron-oxyhydroxide (Akaganeite) with different chlorine occupancy was studied by X-ray diffraction with Rietveld analysis. The structure depends on chlorine occupancy, u in tunnel sites of the phase. The crystal system was assigned to monoclinic (I2/m) throughout u range whereas the lattice and structure parameters changed with u. The chemical formula was estimated to be Fe83+O162−H8+2u+Cl2u(H2O)2w (0.25≤u≤0.56 and w\\simeq0.2) where w denotes fraction of water molecules in tunnel sites. A sample with u=0.44 showed the highest crystal symmetry throughout the u range. The u-dependence of some structural parameters was discussed from the view point of oxygen displacements.

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© 2010 The Japan Institute of Metals and Materials
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