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dc.contributor.authorZhang, Len
dc.contributor.authorRen, Xen
dc.contributor.authorCarpenter, Michaelen
dc.date.accessioned2017-04-06T12:28:56Z
dc.date.available2017-04-06T12:28:56Z
dc.date.issued2017-02-21en
dc.identifier.issn2469-9950
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/263484
dc.description.abstractDielectric and mechanical spectroscopies have been used to investigate ferroelectric transitions and twin wall dynamics in the lead-free ceramic 0.5Ba(Zr$_{0.2}$Ti$_{0.8}$)O$_{3}$−0.5(Ba$_{0.7}$Ca$_{0.3}$)TiO$_{3}$ (abbreviated as BZT-50BCT), which is known to have a high piezoelectric coefficient (d$_{33}$>545pC/N). Results from dynamical mechanical analysis in the frequency range 0.2-20 Hz and resonant ultrasound spectroscopy in the frequency range ∼0.1-1.2MHz confirm the existence of three phase transitions with falling temperature, at ∼360K (cubic-tetragonal), ∼304K (tetragonal-orthorhombic), and ∼273K (orthorhombic-rhombohedral). In comparison with BaTiO$_{3}$, however, the transitions are marked by rounded rather than sharp minima in the shear modulus. The pattern of acoustic loss is also quite different from that shown by BaTiO$_{3}$ in having a broad interval of high loss at low temperatures, consistent with a spectrum of relaxation times for interactions of ferroelastic twin walls. Differences in the dielectric properties also suggest more relaxor like characteristics for BZT-50BCT. It is proposed that the overall pattern of behavior is significantly influenced by strain heterogeneity at a local length scale in the perovskite structure due to the substitution of cations with different ionic radii. The existence of this strain heterogeneity and its influence on the elastic behavior near the transition points could be contributory factors to the development of adaptive nanoscale microstructures and enhanced piezoelectric properties.
dc.description.sponsorshipThe authors gratefully acknowledge the funding support of the China Scholarship Council (Grant No. 201506280034), the National Basic Research Program of China (Grant No. 2012CB619401), National Natural Science Foundation of China (Grants No. 51431007, No. 51372195, No. 51321003, No. 51231008, and No. 51320105014), as well as the Project of the Chinese Academy of Engineering Physics (Grant No. YK2015-0602006). Resonant ultrasound spectroscopy facilities in Cambridge have been funded by the Natural Environment Research Council and the Engineering and Physical Sciences Research Council of Great Britain (Grants No. NE/B505738/1, No. NE/F017081/1, and No. EP/I036079/1).
dc.languageengen
dc.language.isoenen
dc.publisherAmerican Physical Society
dc.titleInfluence of local strain heterogeneity on high piezoelectricity in 0.5Ba(Zr$_{0.2}$Ti$_{0.8}$)O$_{3}$−0.5(Ba$_{0.7}$Ca$_{0.3}$)TiO$_{3}$ ceramicsen
dc.typeArticle
prism.issueIdentifier5en
prism.number054116en
prism.publicationDate2017en
prism.publicationNamePhysical Review Ben
prism.volume95en
dc.identifier.doi10.17863/CAM.8828
dcterms.dateAccepted2017-01-21en
rioxxterms.versionofrecord10.1103/PhysRevB.95.054116en
rioxxterms.versionAMen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-02-21en
dc.identifier.eissn2469-9969
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (EP/P024904/1)
pubs.funder-project-idEPSRC (EP/I036079/1)
pubs.funder-project-idNERC (NE/F017081/1)


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