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Stoichiometry and grain boundaries control by spark plasma sintering in Ba0.6Sr0.4TiO3:Mn/MgO composites

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorELISSALDE, Catherine
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHUNG SEU, U-Chan
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorARTEMENKO, Alla
hal.structure.identifierCentre interuniversitaire de recherche et d'ingénierie des matériaux [CIRIMAT]
dc.contributor.authorESTOURNÈS, Claude
hal.structure.identifierThales Research and Technology [Palaiseau]
dc.contributor.authorCOSTES, Romain
hal.structure.identifierThales Research and Technology [Palaiseau]
dc.contributor.authorPATÉ, Michel
hal.structure.identifierThales Research and Technology [Palaiseau]
dc.contributor.authorGANNE, Jean-Pierre
hal.structure.identifierJulius-Maximilians-Universität Würzburg = University of Würzburg [JMU]
dc.contributor.authorWAECHTER, Sabine
dc.date.issued2012
dc.identifier.issn0002-7820
dc.description.abstractEnThis study highlights the possibility to control materials' chemistry simultaneously at the atomic and micrometric scales and to design functional oxide-based multimaterials, thanks to the specificity of Spark Plasma Sintering (SPS). We have used a dual synthesis route, namely chemical and composite, combined with SPS to adjust the oxidation state of intrinsic and dopant ions, the grain boundaries state, and to control interdiffusion in composites made of Mn-doped Ba0.6Sr0.4TiO3 (BST) and MgO. At the atomic level, the Mn substituent valence state can be fixed according to the sintering process: Electron Paramagnetic Resonance evidenced inline image, inline image, and inline image-VO charged defects. We established a link between the nature of the charged defects and the high-frequency dielectric losses. At the microscopic level, control of the grain size, the grain boundaries, and the interdiffusion between the components is achievable using SPS. The composite effect acts at low frequency by efficiently decreasing the extrinsic losses arising from the grain boundaries contribution and by increasing the thermal stability of the permittivity. Such an approach based on SPS, chemical and composite routes, has allowed designing BST-based composites operating in a wide frequency range (kHz-GHz) with low dielectric losses and high electric field tunability.
dc.language.isoen
dc.publisherWiley
dc.subject.enComposites
dc.subject.enSolid solution
dc.subject.enGrain boundaries
dc.subject.enChemical compounds
dc.subject.enSpark plasma sintering
dc.title.enStoichiometry and grain boundaries control by spark plasma sintering in Ba0.6Sr0.4TiO3:Mn/MgO composites
dc.typeArticle de revue
dc.identifier.doi10.1111/j.1551-2916.2012.05311.x
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of the American Ceramic Society
bordeaux.page3239-3245
bordeaux.volume95
bordeaux.issue10
bordeaux.peerReviewedoui
hal.identifierhal-00745579
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00745579v1
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