Structure of Birnessite Obtained from Decomposition of Permanganate under Soft Hydrothermal Conditions. 1. Chemical and Structural Evolution as a Function of Temperature | Zendy

Anne-Claire Gaillot | Zendy; Bruno Lanson | Zendy; Victor A. Drits | Zendy

Open Access

Structure of Birnessite Obtained from Decomposition of Permanganate under Soft Hydrothermal Conditions. 1. Chemical and Structural Evolution as a Function of Temperature

Author(s) -

Anne-Claire Gaillot,

Bruno Lanson,

Victor A. Drits

Publication year - 2005

Publication title -

chemistry of materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.741

H-Index - 375

eISSN - 1520-5002

pISSN - 0897-4756

DOI - 10.1021/cm0500152

Subject(s) - octahedron , birnessite , crystallography , hydrothermal circulation , permanganate , chemistry , structural formula , crystal structure , materials science , manganese , inorganic chemistry , chemical engineering , organic chemistry , manganese oxide , alkyl , engineering

International audienceThe 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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