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Reversible Topochemical Exsolution of Iron in BaFe 2+ 2 (PO 4 ) 2
Author(s) -
David Rénald,
Kabbour Houria,
Filimonov Dmitry,
Huvé Marielle,
Pautrat Alain,
Mentré Olivier
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201404476
Subject(s) - antiferromagnetism , crystallography , ferromagnetism , valence (chemistry) , crystal structure , crystallinity , materials science , transmission electron microscopy , magnetic susceptibility , chemistry , condensed matter physics , nanotechnology , physics , organic chemistry
BaFe 2+ 2 (PO 4 ) 2 was recently prepared and identified as the first 2D‐Ising ferromagnetic oxide with an original reentrant structural transition driven by high‐spin Fe 2+ ions arranged in honeycomb layers. Both long‐term air exposure and moderate temperature ( T >375 °C) leads to topochemical oxidation into iron‐depleted compounds with mixed Fe 2+ /Fe 3+ valence. This process is unique, as the exsolution is effective even from single crystal with preservation of the initial crystallinity, and the structure of the deficient BaFe 2− x (PO 4 ) 2 ( x