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Intriguing Interconnections Among Phase Transition, Magnetic Moment, and Valence Disproportionation in 2H-Perovskite Related Oxides.

hal.structure.identifierDepartment of Chemistry and Biochemistry [Columbia, South Carolina]
dc.contributor.authorZHAO, Qingbiao
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDARRIET, Jacques
hal.structure.identifierDepartment of Physics and Astronomy [Columbia]
dc.contributor.authorYE, Longfei
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorWHANGBO, Myung-Hwan
hal.structure.identifierDepartment of Chemistry and Biochemistry [Columbia, South Carolina]
dc.contributor.authorSTACKHOUSE, Chavis
hal.structure.identifierDepartment of Chemistry and Biochemistry [Columbia, South Carolina]
dc.contributor.authorZUR LOYE, Hans-Conrad
dc.date.issued2011
dc.identifier.issn0002-7863
dc.description.abstractEnIn this paper we report the crystal growth, structure determination, and magnetic properties of the 2H-perovskite related oxides, Sr(5)Co(4)O(12) and Sr(6)Co(5)O(15), as well as the charge disproportionation and associated phase transition of Sr(5)Co(4)O(12). Sr(5)Co(4)O(12) and Sr(6)Co(5)O(15) are the (m = 2, n = 3) and (m = 1, n = 1) members of the A(3m+3n)A'(n)B(3m+n)O(9m+6n) family, respectively. Sr(6)Co(5)O(15) crystallizes in the space group R32 with lattice parameters of a = 9.5020(10) Å and c = 12.379(8) Å. The structure solution shows that Sr(6)Co(5)O(15) is isostructural with Sr(6)Rh(5)O(15). Magnetic measurements do not indicate any long-range magnetic order, although the Weiss temperature of -248 K indicates the presence of dominant antiferromagnetic interactions. Sr(5)Co(4)O(12) crystallizes in the space group P-3c1 with lattice parameters of a = 9.4705(10) Å and c = 20.063(5) Å at room temperature. The single crystal structure solution revealed that the cobalt ions in the trigonal prismatic sites of Sr(5)Co(4)O(12) undergo a structural transition at ∼170 K, where the cobalt atoms are in the center of the trigonal prisms below this temperature and move partially toward the faces above this temperature. This structure transition is accompanied by a change in the magnetic moment of the oxide and can be related to a valence disproportionation of the cobalt ions and a concomitant Jahn-Teller distortion. In addition, specific heat, Seebeck coefficient, electric conductivity, and magnetic measurements as well as bond valence sum calculations were carried out for Sr(5)Co(4)O(12). Sr(5)Co(4)O(12) exhibits strong magnetic anisotropy but no long-range magnetic order.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.title.enIntriguing Interconnections Among Phase Transition, Magnetic Moment, and Valence Disproportionation in 2H-Perovskite Related Oxides.
dc.typeArticle de revue
dc.identifier.doi10.1021/ja209198b
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of the American Chemical Society
bordeaux.page20981-20994
bordeaux.volume133
bordeaux.issue51
bordeaux.peerReviewedoui
hal.identifierhal-00657861
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00657861v1
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