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Effect of Co substitution on the crystal and magnetic structure of SrFeO2.75-d : stabilization of the "314-type" oxygen vacancy ordered structure without A-site ordering

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMARIK, Sourav
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHENNABASAPPA, Madhu
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorFERNÁNDEZ-SANJULIÁN, Javier
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorPETIT, Emmanuel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorTOULEMONDE, Olivier
dc.date.issued2016
dc.identifier.issn0020-1669
dc.description.abstractEnA study of the structure-composition-properties correlation is reported for the oxygen-deficient SrFe1-xCoxO2.75-δ (x = 0.1-0.85) materials. The introduction of Co in the parent SrFeO2.75 (Sr4Fe4O11) structure revealed an interesting structural transformation. At room temperature (RT), an orthorhombic (space group Cmmm, 2√2ap × 2ap × √2ap type, ap = lattice parameter of the cubic perovskite) → tetragonal (space group P4/mmm, ap × ap × 2ap type) → tetragonal (space group I4/mmm, 2ap × 2ap × 4ap type) structural transformation is observed in parallel with increasing Co content and decreasing oxygen content in the structure. At the same time, a rich variation in the magnetic properties is explored. The samples with x = 0.25, 0.3 show temperature-induced magnetization reversal. With increasing Co content in the structure, magnetic interactions start to weaken due to the random distribution of Fe and Co in the structure; the x = 0.5 sample shows frustration in the magnetic behavior with much smaller magnetization value. With a further increase in the Co content in the structure, RT ferrimagnetic-type behavior is observed for the sample with x = 0.85. The nuclear and magnetic structure refinements using RT and low-temperature neutron powder diffraction (NPD, 10 K) patterns confirm the formation of a "314-type" novel oxygen vacancy ordered phase for the sample with x = 0.85, which is the first case of "314-type" novel oxygen vacancy ordering without A-site (ABO3-δ type perovskite) ordering. The magnetic structure is G-type antiferromagnetic starting at room temperature. Further, the stabilization of the "314-type" complex superstructure is related to the ordering of oxygen vacancies in the oxygen-deficient Co-O layers, and the same assists in building a network of Co ions with different coordination environments, each with different spin states, and forms the spin-state ordering.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.title.enEffect of Co substitution on the crystal and magnetic structure of SrFeO2.75-d : stabilization of the "314-type" oxygen vacancy ordered structure without A-site ordering
dc.typeArticle de revue
dc.identifier.doi10.1021/acs.inorgchem.6b01554
dc.subject.halChimie/Matériaux
bordeaux.journalInorganic Chemistry
bordeaux.page9778-9789
bordeaux.volume55
bordeaux.issue19
bordeaux.peerReviewedoui
hal.identifierhal-01380968
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01380968v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Inorganic%20Chemistry&rft.date=2016&rft.volume=55&rft.issue=19&rft.spage=9778-9789&rft.epage=9778-9789&rft.eissn=0020-1669&rft.issn=0020-1669&rft.au=MARIK,%20Sourav&CHENNABASAPPA,%20Madhu&FERN%C3%81NDEZ-SANJULI%C3%81N,%20Javier&PETIT,%20Emmanuel&TOULEMONDE,%20Olivier&rft.genre=article


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