Reversible Topochemical Exsolution of Iron in BaFe 2+  2 (PO 4 ) 2 | Zendy

David Rénald | Zendy; Kabbour Houria | Zendy; Filimonov Dmitry | Zendy; Huvé Marielle | Zendy; Pautrat Alain | Zendy; Mentré Olivier | Zendy

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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

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