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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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Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics

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dc.contributor.author Dittmer, Robert ko
dc.contributor.author Jo, Wook ko
dc.contributor.author Webber, Kyle G. ko
dc.contributor.author Jones, Jacob L. ko
dc.contributor.author Roedel, Juergen ko
dc.date.available 2015-01-19T00:05:12Z -
dc.date.created 2014-10-15 ko
dc.date.issued 2014-02 -
dc.identifier.citation JOURNAL OF APPLIED PHYSICS, v.115, no.8, pp.1 - 7 ko
dc.identifier.issn 0021-8979 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/10166 -
dc.description.abstract The temperature-dependent Young's modulus Y(T) of the lead-free piezoceramics of 0.8Bi(1/2)Na(1/2)TiO(3)-0.2Bi(1/2)K(1/2)TiO(3) (20BKT) and 0.96(0.8Bi(1/2)Na(1/2)TiO(3)-0.2Bi(1/2)K(1/2)TiO(3))-0.04 BiZn1/2Ti1/2O3 (4BZT) is measured with the impulse excitation technique and contrasted with corresponding dielectric and structural data. While the dielectric properties suggest a phase transition, the high resolution XRD patterns remain virtually unchanged from room temperature up to high temperatures, confirming no change in their long-range order. In contrast, the elastic properties indicate a broad and diffuse ferroelastic transition denoted by a minimum in Y(T). By analogy to the elastic and dielectric data of PbZrxTi1-xO3 and PLZT, it is concluded that 20BKT and 4BZT are relaxors with polar nanoregions embedded in a metrically cubic matrix. Interestingly, no indication for the freezing temperature was reflected in any of the employed measurement techniques. From the saturation of Y(T), it is suggested that the Burns temperature may be approximated as 700 degrees C. Moreover, it is found that the modification with the ternary end-member BiZn1/2Ti1/2O3 results in an increase in Young's modulus. A comparison with the Bi1/2Na1/2TiO3-BaTiO3-K0.5Na0.5NbO3 yields the same results. ko
dc.description.statementofresponsibility open -
dc.language ENG ko
dc.publisher AMER INST PHYSICS ko
dc.subject PHASE-TRANSITIONS ko
dc.subject FERROELECTRIC CERAMICS ko
dc.subject SOLID-SOLUTION ko
dc.subject INTERNAL STRAIN ko
dc.subject BARIUM-TITANATE ko
dc.subject MECHANICAL LOSS ko
dc.subject YOUNGS MODULUS ko
dc.subject DOMAIN-WALLS ko
dc.subject BEHAVIOR ko
dc.subject DIFFRACTION ko
dc.title Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84896761094 ko
dc.identifier.wosid 000332619600065 ko
dc.type.rims ART ko
dc.description.wostc 0 *
dc.description.scopustc 0 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1063/1.4866092 ko
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