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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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Reconciling local structure disorder and the relaxor state in (Bi1/2Na1/2)TiO3 -BaTiO3

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dc.contributor.authorGroszewicz, Pedro B.ko
dc.contributor.authorGröting, Melanieko
dc.contributor.authorBreitzke, Hko
dc.contributor.authorJo, Wookko
dc.contributor.authorAlbe, Karstenko
dc.contributor.authorBuntkowsky, Gerdko
dc.contributor.authorRödel, Jürgenko
dc.date.available2016-09-08T10:34:15Z-
dc.date.created2016-09-02ko
dc.date.issued201608ko
dc.identifier.citationSCIENTIFIC REPORTS, v.6, no., pp.31739 -ko
dc.identifier.issn2045-2322ko
dc.identifier.urihttp://scholarworks.unist.ac.kr/handle/201301/20416-
dc.identifier.urihttp://www.nature.com/articles/srep31739ko
dc.description.abstractLead-based relaxor ferroelectrics are key functional materials indispensable for the production of multilayer ceramic capacitors and piezoelectric transducers. Currently there are strong efforts to develop novel environmentally benign lead-free relaxor materials. The structural origins of the relaxor state and the role of composition modifications in these lead-free materials are still not well understood. In the present contribution, the solid-solution (100-x)(Bi1/2Na1/2)TiO3 -xBaTiO3 (BNT-xBT), a prototypic lead-free relaxor is studied by the combination of solid-state nuclear magnetic resonance (NMR) spectroscopy, dielectric measurements and ab-initio density functional theory (DFT). For the first time it is shown that the peculiar composition dependence of the EFG distribution width (��QIS width) correlates strongly to the dispersion in dielectric permittivity, a fingerprint of the relaxor state. Significant disorder is found in the local structure of BNT-xBT, as indicated by the analysis of the electric field gradient (EFG) in 23 Na 3QMAS NMR spectra. Aided by DFT calculations, this disorder is attributed to a continuous unimodal distribution of octahedral tilting. These results contrast strongly to the previously proposed coexistence of two octahedral tilt systems in BNT-xBT. Based on these results, we propose that considerable octahedral tilt disorder may be a general feature of these oxides and essential for their relaxor properties. ? The Author(s) 2016ko
dc.description.statementofresponsibilityopen-
dc.languageENGko
dc.publisherNATURE PUBLISHING GROUPko
dc.titleReconciling local structure disorder and the relaxor state in (Bi1/2Na1/2)TiO3 -BaTiO3ko
dc.typeARTICLEko
dc.identifier.pid1521null
dc.identifier.rimsid26703ko
dc.identifier.scopusid2-s2.0-84983234048ko
dc.identifier.wosid000381695000001ko
dc.type.rimsAko
dc.identifier.doihttp://dx.doi.org/10.1038/srep31739ko
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