Spectral deconvolution as a tool to understanding Curie-Temperature Shifting and Niobium Off-Centering Phenomenon in Ferroelectrics of Type Niobates

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dc.contributor.authorLanfredi, S. [UNESP]
dc.contributor.authorNobre, M. A.L. [UNESP]
dc.contributor.authorBesse, M. R. [UNESP]
dc.contributor.authorLima, A. R.F.
dc.contributor.authorPalacio, G. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2018-12-11T16:43:26Z
dc.date.available2018-12-11T16:43:26Z
dc.date.issued2015-01-01
dc.description.abstractSolid solutions based on the KSr2Nb5O15 host-structure with stoichiometry KSr2(NixNb5-x)O15-δ, where x = 0.25, 0.50 and 0.75 were synthesized. Single phase nanopowders were synthesized via Modified Poliol method. Both X-ray diffraction and Infrared spectroscopy were used to derive the magnitude of the niobium off-center. Curie temperature was derived by X-ray diffraction measurements and Infrared spectroscopy. Deconvolution of the infrared spectra based on a set of Gaussian functions was applied to derive oscillating frequency assigned to the bond niobium off-center apical oxygen, while crystallographic parameters were derived via Rietveld Method. The shifting of Nb cation along of c-axis and its correlation with to octahedra distortion allowed to derive further inter-correlation between niobium-offcenter degree and softening phenomena. Curie-temperature shifting to low temperature domain as a function of doping of host structure with Ni cation is discussed.en
dc.description.affiliationFac de Ciências e Tecnologia - FCT Univ Estadual Paulista - UNESP, P.O Box 467
dc.description.affiliationInstituto de Biociências Letras e Ciências Exatas Univ Estadual Paulista - UNESP, P.O. Box 6154
dc.description.affiliationLIEC-Laboratorio Interdisciplinar de Eletroquímica e Cerâmica Department of Chemistry UFSCar-Federal University of São Carlos, P.O Box 676
dc.description.affiliationInstituto de Química - Univ Estadual Paulista - UNESP
dc.description.affiliationUnespFac de Ciências e Tecnologia - FCT Univ Estadual Paulista - UNESP, P.O Box 467
dc.description.affiliationUnespInstituto de Biociências Letras e Ciências Exatas Univ Estadual Paulista - UNESP, P.O. Box 6154
dc.description.affiliationUnespInstituto de Química - Univ Estadual Paulista - UNESP
dc.format.extent5839-5869
dc.identifierhttp://dx.doi.org/10.12988/ams.2015.56445
dc.identifier.citationApplied Mathematical Sciences, v. 9, n. 117, p. 5839-5869, 2015.
dc.identifier.doi10.12988/ams.2015.56445
dc.identifier.issn1314-7552
dc.identifier.issn1312-885X
dc.identifier.scopus2-s2.0-84981252378
dc.identifier.urihttp://hdl.handle.net/11449/168870
dc.language.isoeng
dc.relation.ispartofApplied Mathematical Sciences
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectDeconvolution
dc.subjectForce constant
dc.subjectGaussian function
dc.subjectInfrared spectroscopy
dc.subjectNiobium off-center
dc.titleSpectral deconvolution as a tool to understanding Curie-Temperature Shifting and Niobium Off-Centering Phenomenon in Ferroelectrics of Type Niobatesen
dc.typeArtigo

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