Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/39412

TitleFerroelectric phase transitions studies in 0.5Ba(Zr0.2Ti0.8) O3-0.5(Ba0.7Ca0.3)TiO3 ceramics
Author(s)Silva, J. P. B.
Queirós, E. C.
Tavares, P. B.
Sekhar, K. C.
Kamakshi, Koppole
Moreira, J. A.
Almeida, A.
Pereira, Mário
Gomes, M. J. M.
KeywordsBCZTceramics
Ramanspectroscopy
Ferroelectricproperties
Dielectricproperties
Issue date2015
PublisherSpringer
JournalJournal of Electroceramics
Abstract(s)The ferroelectric phase transitions in 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 (BCZT 50/50) ceramics,fabricatedbyasolidstatereaction,werestudiedbyusing X-Ray diffraction, Raman spectroscopy, and measuring electric polarization, dielectric permittivity and pyroelectric current. Xraydiffraction(XRD)confirmsthecoexistenceoftetragonal(T) andrhombohedral(R)phasesatroomtemperature.Thetemperature dependence of the Raman modes frequency reveals the existenceoftwophasetransitionscorrespondingtotherhombohedral – tetragonal, and tetragonal - cubic close to 30 and 100 °C, respectively. The temperature dependence of electric polarization,pyroelectriccurrent,anddielectricpermittivityfurther supports theferroelectric (tetragonal) toparaelectric (cubic) phasetransition.Moreover,thedielectricpermittivityrevealsthe diffuseness of the phase transition and is attributed to the compositional fluctuations of different polar micro-regions.
TypeArticle
URIhttp://hdl.handle.net/1822/39412
DOI10.1007/s10832-015-0005-y
ISSN1385-3449
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CDF - FMNC - Artigos/Papers (with refereeing)

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