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dc.contributor.authorPrades Tena, Marta
dc.contributor.authorBeltrán Mir, Héctor
dc.contributor.authorMasó, Nahum
dc.contributor.authorCordoncillo, Eloisa
dc.contributor.authorWest, Anthony R.
dc.date.accessioned2010-04-01T11:15:20Z
dc.date.available2010-04-01T11:15:20Z
dc.date.issued2008
dc.identifier.issn00218979
dc.identifier.urihttp://hdl.handle.net/10234/10495
dc.description.abstractThe ferroelectric tetragonal tungsten bronze TTB phases, Ba2RETi2Nb3O15 :RE=Nd,Sm, were prepared by low temperature solvothermal synthesis. The permittivity versus temperature data of sintered ceramics show two unusual features: first, a hysteresis of 50–100 °C between values of the Curie temperature Tc on heat-cool cycles and second: a huge depression in the Curie–Weiss temperature T0. Both effects are attributed to the complex nature of their TTB-related crystal structures with different superstructures above and below Tc and the difficulty in nucleating ferroelectric domains on cooling through Tc. Several factors may contribute to the latter difficulty: first, the structures contain two sets of crystallographic sites for the “active” Ti, Nb ions; second, the distribution of Ti and Nb over these two sets of sites is not random but partially ordered; and third, below Tc a weak commensurate superstructure perpendicular to the polar c axis is present, but above Tc a weak incommensurate superstructure in a similar orientation is present. Hence the formation of the ferroelectric structure on cooling requires both nucleation of polar domains involving two sets of cation sites and structural change from an incommensurate to a commensurate supercellen
dc.format.extent5 p.
dc.language.isoengen
dc.publisherAmerican Institute of Physicsen
dc.relation.isPartOfSeriesJournal of applied physics; núm. 104
dc.rightsCopyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Appleid Physics, 2008, n. 104, p. 104118, and may be found at http://adsabs.harvard.edu/abs/2008JAP...104j4118P
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/*
dc.subjectDomain structureen
dc.subjectHysteresisen
dc.subjectPhase transitions and Curie pointen
dc.subjectPermittivityen
dc.subject.otherTransformacions de fase
dc.subject.otherHisteresi
dc.titlePhase transition hysteresis and anomalous Curie-Weis behavior of ferroelectric tetragonaltungsten bronzes Ba2RETi2Nb3O15:RE=Nd, Smen
dc.typeinfo:eu-repo/semantics/articleen
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess


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