GAUDIN, Etienne; GOGLIO, Graziella; BESNARD, A.; DARRIET, Jacques

doi:10.1016/S0022-4596(03)00043-4

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GAUDIN, Etienne
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GOGLIO, Graziella
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

BESNARD, A.
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Ce document a été publié dans

Journal of Solid State Chemistry. 2003, vol. 175, n° 1, p. 124-131

Elsevier

Résumé en anglais

The compound La2Ca2MnO6(O2) has been synthesized from La2Ca2MnO7 heated at 1123 K under high pressure (4 GPa) with KClO3 as oxygen source. The crystal structure has been refined from X-ray powder data in the R3m space group. The unit-cell parameters are a=5.6335(2) Å and c=17.4879(8) Å. Perpendicular to the c-axis, the structure is built up by the periodic stacking of two close packed [LaO3] layers separated by a layer of composition [Ca2O2] containing (O2)2− peroxide ions. This oxide belongs to the family of compounds formulated as [A′2O2−δ][AnBn−1O3n] for n=2 and δ=0. It is the first member of the series where the thickness of the perovskite slab corresponds to one [BO6] (B=Mn) octahedron. The structural relationships with La2Ca2MnO7 are discussed and the magnetic properties show that in both phases manganese is tetravalent.< Réduire

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Oxygen pressure

Hexagonal perovskite

Stoichiometry

Rietveld refinement

Magnetic properties

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Synthesis, crystal structure, and magnetic properties of the manganate La2Ca2MnO6(O2) related to the hexagonal perovskite-type structure

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