Crystal chemistry of non‐perovskite manganese oxides – implications for magnetic properties
Identifieur interne : 000206 ( France/Analysis ); précédent : 000205; suivant : 000207Crystal chemistry of non‐perovskite manganese oxides – implications for magnetic properties
Auteurs : P. Strobel [France] ; A. Ibarra-Palos [France] ; M. Pernet [France] ; S. Zouari [Tunisie] ; W. Cheikh-Rouhou [Tunisie] ; A. Cheikh-Rouhou [Tunisie]Source :
- physica status solidi (c) [ 1610-1634 ] ; 2004-05.
English descriptors
Abstract
This paper reviews crystal structures of ternary manganese oxides and their implications for magnetic properties. We point out the critical role of the counter‐cation (A) size in driving given stoichiometries to different structure types, in particular AMnO3 compositions to ilmenite or perovskite structure, or A2MnO4 ones to spinel or K2NiF4 type. Mn2+ lies near the size borderline. It occupies the large site in A2Mn2O7 pyrochlores, contrary to Mn4+, and occupies separate crystallographic sites in known mixed‐valent Mn2+–Mn3+ or 4+ oxides. The bond distances, Mn–O–Mn bonding angles and Mn sublattice topology are given for the main A–Mn–O structures. Only the perovskite and K2NiF4 structures give Mn–O–Mn angles near 180°, while these are close to 90° in spinels, to 135° in pyrochlores and marokites. The magnetic properties of non‐perovskite manganese oxides are briefly discussed in view of these structural features. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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DOI: 10.1002/pssc.200304432
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