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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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On the phase identity and its thermal evolution of lead free (Bi1/2Na1/2)TiO3-6 mol% BaTiO3

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dc.contributor.author Jo, Wook ko
dc.contributor.author Schaab, Silke ko
dc.contributor.author Sapper, Eva ko
dc.contributor.author Schmitt, Ljubomira A. ko
dc.contributor.author Kleebe, Hans-Joachim ko
dc.contributor.author Bell, Andrew J. ko
dc.contributor.author Roedel, Juergen ko
dc.date.available 2014-10-21T08:35:01Z -
dc.date.created 2014-10-21 ko
dc.date.issued 2011-10 -
dc.identifier.citation JOURNAL OF APPLIED PHYSICS, v.110, no.7, pp. - ko
dc.identifier.issn 0021-8979 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/7547 -
dc.identifier.uri http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=80055002535 ko
dc.description.abstract Temperature-dependent dielectric permittivity of 0.94(Bi1/2Na1/2) TiO3-0.06BaTiO(3) (BNT-6BT) lead-free piezoceramics was studied to disentangle the existing unclear issues over the crystallographic aspects and phase stability of the system. Application of existing phenomenological relaxor models enabled the relaxor contribution to the entire dielectric permittivity spectra to be deconvoluted. The deconvoluted data in comparison with the temperature-dependent dielectric permittivity of a classical perovskite relaxor, La-modified lead zirconate titanate, clearly suggest that BNT-6BT belongs to the same relaxor category, which was also confirmed by a comparative study on the temperature-dependent polarization hysteresis loops of both materials. Based on these results, we propose that the low-temperature dielectric anomaly does not involve any phase transition such as ferroelectric-toantiferroelectric. Supported by transmission electron microscopy and X-ray diffraction experiments at ambient temperature, we propose that the commonly observed two dielectric anomalies are attributed to thermal evolution of ferroelectric polar nanoregions of R3c and P4bm symmetry, which coexist nearly throughout the entire temperature range and reversibly transform into each other with temperature. ko
dc.description.statementofresponsibility open -
dc.language ENG ko
dc.publisher AMER INST PHYSICS ko
dc.subject Comparative studies ko
dc.subject Dielectric anomaly ko
dc.subject Dielectric permittivities ko
dc.subject Lead free piezoceramics ko
dc.subject Lead zirconate titanate ko
dc.subject Lead-Free ko
dc.subject Low temperatures ko
dc.subject Polar nanoregions ko
dc.subject Polarization hysteresis loops ko
dc.subject Relaxors ko
dc.subject Temperature dependent ko
dc.subject Temperature range ko
dc.subject Thermal evolution ko
dc.subject TiO ko
dc.title On the phase identity and its thermal evolution of lead free (Bi1/2Na1/2)TiO3-6 mol% BaTiO3 ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-80055002535 ko
dc.identifier.wosid 000295883000086 ko
dc.type.rims ART ko
dc.description.wostc 112 *
dc.description.scopustc 83 *
dc.date.tcdate 2015-05-06 *
dc.date.scptcdate 2014-10-21 *
dc.identifier.doi 10.1063/1.3645054 ko
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