Synthesis, crystal structure, and magnetic properties of the manganate La2Ca2MnO6(O2) related to the hexagonal perovskite-type structure
Language
en
Article de revue
This item was published in
Journal of Solid State Chemistry. 2003, vol. 175, n° 1, p. 124-131
Elsevier
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Oxygen pressure
Hexagonal perovskite
Stoichiometry
Rietveld refinement
Magnetic properties
Origin
Hal imported