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Transformation of synthetic γ‐FeOOH (lepidocrocite) in aqueous solutions of ferrous sulphate
Author(s) -
Bechinê K.,
Šubrt J.,
Hanslík T.,
Zapletal V.,
Tláskal J.,
Lipka Josef,
Sedlák B.,
Rotter M.
Publication year - 1982
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19824890122
Subject(s) - lepidocrocite , goethite , hematite , dissolution , materials science , crystallization , aqueous solution , chemical engineering , particle size , phase (matter) , ferrous , particle (ecology) , transformation (genetics) , mineralogy , inorganic chemistry , chemistry , metallurgy , geology , organic chemistry , biochemistry , oceanography , adsorption , gene , engineering
The course of the transformation of synthetic γ‐FeOOH (lepidocrocite) samples, prepared by different methods was investigated and the effect of a preliminary heat treatment of the initial material on the product phase composition and morphology studied. Both the goethite‐tohematite ratio and the particle size of the products depend on the preparation method and on the preliminary heat treatment of the initial lepidocrocite. The results are discussed in terms of the dissolution of the less stable lepidocrocite followed by the crystallization of the more stable phases α‐FeOOH and α‐Fe 2 O 3 from the solution. The final product phase composition and the particle size are affected considerably by a presence of goethite and/or hematite germs in the initial γ‐FeOOH.