Crystal structure and magnetic properties of Sr4Mn2NiO9
Identifieur interne : 000275 ( France/Analysis ); précédent : 000274; suivant : 000276Crystal structure and magnetic properties of Sr4Mn2NiO9
Auteurs : Ahmed El Abed [France] ; Etienne Gaudin [France] ; Sylvain Lemaux [France] ; Jacques Darriet [France]Source :
- Solid State Sciences [ 1293-2558 ] ; 2001.
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Abstract
The crystal structure of Sr4Mn2NiO9 has been refined on single crystal. This phase belongs to the series A1+x(A′xB1–x)O3 (x=1/3) related to the 2H-hexagonal perovskite. The structure contains transition metals in chains of oxide polyhedra (trigonal prisms and octahedra); neighboring chains are separated from each other by the Sr atoms. The sequence of the face sharing polyhedra along the chains is two octahedra+one trigonal prism. Mn occupies the octahedra and Ni is disordered in the trigonal prism with ≈80% in the pseudo square faces of the prism and ≈20% at the centre. This result has been confirmed by XANES experiments at Mn K and Ni K edges, respectively. Sr4Mn2NiO9 is antiferromagnetic with a Néel temperature at T=3 K. The Curie constant measured at high temperature is in good agreement with ≈80% of the Ni2+ ions in the spin state configuration S=0.
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DOI: 10.1016/S1293-2558(01)01213-4
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ISTEX:6D4758B098D1D260961CBE5B84CBC425C1EB37B8Le document en format XML
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This phase belongs to the series A1+x(A′xB1–x)O3 (x=1/3) related to the 2H-hexagonal perovskite. The structure contains transition metals in chains of oxide polyhedra (trigonal prisms and octahedra); neighboring chains are separated from each other by the Sr atoms. The sequence of the face sharing polyhedra along the chains is two octahedra+one trigonal prism. Mn occupies the octahedra and Ni is disordered in the trigonal prism with ≈80% in the pseudo square faces of the prism and ≈20% at the centre. This result has been confirmed by XANES experiments at Mn K and Ni K edges, respectively. Sr4Mn2NiO9 is antiferromagnetic with a Néel temperature at T=3 K. The Curie constant measured at high temperature is in good agreement with ≈80% of the Ni2+ ions in the spin state configuration S=0.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Aquitaine</li><li>Nouvelle-Aquitaine</li></region><settlement><li>Pessac</li></settlement></list><tree><country name="France"><region name="Nouvelle-Aquitaine"><name sortKey="El Abed, Ahmed" sort="El Abed, Ahmed" uniqKey="El Abed A" first="Ahmed" last="El Abed">Ahmed El Abed</name></region><name sortKey="Darriet, Jacques" sort="Darriet, Jacques" uniqKey="Darriet J" first="Jacques" last="Darriet">Jacques Darriet</name><name sortKey="Darriet, Jacques" sort="Darriet, Jacques" uniqKey="Darriet J" first="Jacques" last="Darriet">Jacques Darriet</name><name sortKey="Gaudin, Etienne" sort="Gaudin, Etienne" uniqKey="Gaudin E" first="Etienne" last="Gaudin">Etienne Gaudin</name><name sortKey="Lemaux, Sylvain" sort="Lemaux, Sylvain" uniqKey="Lemaux S" first="Sylvain" last="Lemaux">Sylvain Lemaux</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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