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dc.contributor.authorRotaru, Andreien
dc.contributor.authorSchiemer, Jason Aen
dc.contributor.authorCarpenter, Michaelen
dc.date.accessioned2016-01-22T16:48:20Z
dc.date.available2016-01-22T16:48:20Z
dc.date.issued2016-01-06en
dc.identifier.citationJournal of Thermal Analysis and Calorimetry 2016.en
dc.identifier.issn1388-6150
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/253446
dc.description.abstractTetragonal tungsten bronze (TTB) structures offer some promise as lead-free ferroelectrics and have an advantage of great flexibility in terms of accessible composition ranges due to the number of crystallographic sites available for chemical substitution. The ferroic properties of interest are coupled with strain, which will be important in the context of stability, switching dynamics and thin film properties. Coupling of strain with the ferroelectric order parameter give rise to changes in elastic properties and these have been investigated for a ceramic sample of Ba6GaNb9O30 (BGNO) by resonant ultrasound spectroscopy (RUS). Room temperature values of the shear and bulk moduli for BGNO are rather higher than for TTB’s with related composition which are orthorhombic at room temperature, consistent with suppression of the ferroelectric transition. Instead, a broad, rounded minimum in the shear modulus measured at ~1 MHz is accompanied by a broad rounded maximum in acoustic loss near 115 K, and signifies relaxor freezing behaviour. Elastic softening with falling temperature from room temperature, ahead of the freezing interval, is attributed to the development of dynamical polar nanoregions (PNRs), while the non-linear stiffening below ~115 K is consistent with a spectrum of relaxation times for freezing of the PNR microstructure.
dc.description.sponsorshipThis work was supported by the strategic grant POSDRU/159/1.5/S/133255, Project ID 133255 (2014), co-financed by the European Social Fund within the Sectorial Operational Program Human Resources Development 2007 –2013. RUS facilities in Cambridge were established with funding from the Natural Environment Research Council (grants NE/B505738/1, NE/F017081/1) and from the Engineering and Physical Sciences Research Council (EP/I036079/1).
dc.languageEnglishen
dc.language.isoenen
dc.publisherSpringer
dc.rightsAttribution 4.0 International
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectbulk modulusen
dc.subjectceramicsen
dc.subjectelastic propertiesen
dc.subjectphase transitionsen
dc.subjectpolar nanoregions (PNRs)en
dc.subjectrelaxor dielectricsen
dc.subjectresonant ultrasound spectroscopy (RUS)en
dc.subjectshear modulusen
dc.subjecttetragonal tungsten bronzes (TTBs)en
dc.titleElastic and anelastic relaxations accompanying relaxor ferroelectric behaviour of Ba6GaNb9O30 tetragonal tungsten bronze from resonant ultrasound spectroscopyen
dc.typeArticle
dc.description.versionThis is the final version of the article. It first appeared from [Springer via https://doi.org/10.1007/s10973-015-5202-zen
prism.endingPage583
prism.publicationDate2016en
prism.publicationNameJournal of Thermal Analysis and Calorimetryen
prism.startingPage571
prism.volume124en
dc.rioxxterms.funderNERC
dc.rioxxterms.funderEPSRC
dc.rioxxterms.projectidNE/B505738/1
dc.rioxxterms.projectidNE/F017081/1
dc.rioxxterms.projectidEP/I036079/1
rioxxterms.versionofrecord10.1007/s10973-015-5202-zen
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/en
rioxxterms.licenseref.startdate2016-01-06en
dc.identifier.eissn1588-2926
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idNERC (NE/F017081/1)
pubs.funder-project-idEPSRC (EP/I036079/1)
cam.orpheus.successThu Jan 30 12:55:22 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2100-01-01


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International