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β-Ferric Oxyhydroxide

Published online by Cambridge University Press:  14 March 2018

A. L. Mackay
A. L. Mackay*
Affiliation:
Birkbeck College Crystallographic Laboratory, London
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Summary

The crystallographic properties of the hydrated iron oxide obtained by the hydrolysis of FeCl3 are described. The characterizing X-ray powder pattern can be indexed on a tetragonal unit cell with a 10·48 and c 3·023 Å. This cell is shown to contain eight formula units of FeOOH but Cl- or other anions are necessary for the crystallization of the material The structure is that of hollandite or α-MnO2. The unit cell has been confirmed by electron diffraction from single crystals having dimensions about 5000 × 500 × 500 Å. and twinning, which produces hexagonal stars, has been studied. On heating, the structure breaks down and recrystallizes as α-Fe2O2, probably with an intermediate stage involving a spinel phase.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 250 , September 1960 , pp. 545 - 557
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1960

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