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| HAL: hal-00106999, version 1 |
| DOI: 10.1021/cm0500152 |
| Detailed view |  Export this paper |
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| Chemistry of Materials 17 (11) (2005) 2959-2975 |
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| Structure of birnessite obtained from decomposition of permanganate under soft hydrothermal conditions. I. Chemical and structural evolution as a function of temperature. |
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| Anne-Claire Gaillot 1Bruno Lanson 1 |
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| (2005) |
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| The structure of a synthetic K-rich birnessite (KBi) prepared by hydrothermally reacting (4 days at 170°C) a finely ground KMnO4 powder in acidified water was determined. At room temperature the structure of KBi corresponds to a 3R - polytype which can be described as using the close-packing formalism. Assuming an orthogonal base-centered unit cell, KBi has a = b√3 = 4.923 A, b = 2.845 A, γ = 90° and c = 21.492 A. The layer charge deficit originates exclusively from the presence of vacant layer sites as only Mn AbC...BcACaBAbC c' b' a' c' a' b' 4+ cations are present in the octahedral layers, and the following structural formula can be proposed: |
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| 1: | Laboratoire de géophysique interne et tectonophysique (LGIT) |
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CNRS : UMR5559 – IRD – LCPC – OSUG – INSU – Université de Savoie – Université Joseph Fourier - Grenoble I |
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| 2: | Geological Institute |
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Russian Academy of Sciences |
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| Subject | : | Sciences of the Universe/Earth Sciences/Geochemistry Environmental Sciences/Global Changes |
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| hal-00106999, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00106999 | |
| oai:hal.archives-ouvertes.fr:hal-00106999 | |
| From: Pascale Talour | |
| Submitted on: Tuesday, 17 October 2006 09:26:07 | |
| Updated on: Wednesday, 29 April 2009 16:02:03 | |
