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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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Ergodicity reflected in macroscopic and microscopic field-dependent behavior of BNT-based relaxors

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dc.contributor.author Dittmer, Robert ko
dc.contributor.author Gobeljic, Danka ko
dc.contributor.author Jo, Wook ko
dc.contributor.author Shvartsman, Vladimir V. ko
dc.contributor.author Lupascu, Doru C. ko
dc.contributor.author Jones, Jacob L. ko
dc.contributor.author Roedel, Juergen ko
dc.date.available 2014-10-21T08:34:16Z -
dc.date.created 2014-10-21 ko
dc.date.issued 2014-02 -
dc.identifier.citation JOURNAL OF APPLIED PHYSICS, v.115, no.8, pp.1 - 10 ko
dc.identifier.issn 0021-8979 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/7511 -
dc.identifier.uri http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84896748381 ko
dc.description.abstract The effect of heterovalent B-site doping on ergodicity of relaxor ferroelectrics is studied using (1 - y)(0.81Bi(1/2)Na(1/2)TiO(3)-0.19Bi(1/2)K(1/2)TiO(3))-yBiZn(1/2)Ti(1/2)O(3) (BNT-BKT-BZT) with y - {0.02;0.03;0.04} as a model system. Both the large- and small-signal parameters are studied as a function of electric field. The crystal structure is assessed by means of neutron diffraction in the initial state and after exposure to a high electric field. In order to measure ferroelastic domain textures, diffraction patterns of the poled samples are collected as a function of sample rotation angle. Piezoresponse force microscopy (PFM) is employed to probe the microstructure for polar regions at a nanoscopic scale. For low electric fields E < 2 kV.mm(-1), large- and small-signal constitutive behavior do not change with composition. At high electric fields, however, drastic differences are observed due to a field-induced phase transition into a long-range ordered state. It is hypothesized that increasing BZT content decreases the degree of non-ergodicity; thus, the formation of long-range order is impeded. It is suggested that frozen and dynamic polar nano regions exist to a different degree, depending on the BZT content. This image is supported by PFM measurements. Moreover, PFM measurements suggest that the relaxation mechanism after removal of the bias field is influenced by surface charges ko
dc.description.statementofresponsibility open -
dc.language ENG ko
dc.publisher AMER INST PHYSICS ko
dc.subject LEAD-FREE PIEZOCERAMICS ko
dc.subject FREE PIEZOELECTRIC CERAMICS ko
dc.subject PHASE-TRANSITION ko
dc.subject FERROELECTRICS ko
dc.subject TEMPERATURE ko
dc.subject PERSPECTIVE ko
dc.subject STRAIN ko
dc.title Ergodicity reflected in macroscopic and microscopic field-dependent behavior of BNT-based relaxors ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84896748381 ko
dc.identifier.wosid 000332619600068 ko
dc.type.rims ART ko
dc.description.wostc 2 *
dc.description.scopustc 0 *
dc.date.tcdate 2015-05-06 *
dc.date.scptcdate 2014-10-21 *
dc.identifier.doi 10.1063/1.4867157 ko
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