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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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Nanoscale Insight Into Lead-Free BNT-BT-xKNN

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dc.contributor.author Dittmer, Robert ko
dc.contributor.author Jo, Wook ko
dc.contributor.author Roedel, Juergen ko
dc.contributor.author Kalinin, Sergei ko
dc.contributor.author Balke, Nina ko
dc.date.available 2014-10-21T08:34:40Z -
dc.date.created 2014-10-21 ko
dc.date.issued 2012-10 -
dc.identifier.citation ADVANCED FUNCTIONAL MATERIALS, v.22, no.20, pp.4208 - 4215 ko
dc.identifier.issn 1616-301X ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/7530 -
dc.identifier.uri http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84867487965 ko
dc.description.abstract Piezoresponse force microscopy (PFM) is used to afford insight into the nanoscale electromechanical behavior of lead-free piezoceramics. Materials based on Bi1/2Na1/2TiO3 exhibit high strains mediated by a field-induced phase transition. Using the band excitation technique the initial domain morphology, the poling behavior, the switching behavior, and the time-dependent phase stability in the pseudo-ternary system (1x)(0.94Bi1/2Na1/2TiO3-0.06BaTiO3)-xK0.5Na0.5NbO3 (0 <= x <= 18 mol%) are revealed. In the base material (x = 0 mol%), macroscopic domains and ferroelectric switching can be induced from the initial relaxor state with sufficiently high electric field, yielding large macroscopic remanent strain and polarization. The addition of KNN increases the threshold field required to induce long range order and decreases the stability thereof. For x = 3 mol% the field-induced domains relax completely, which is also reflected in zero macroscopic remanence. Eventually, no long range order can be induced for x >= 3 mol%. This PFM study provides a novel perspective on the interplay between macroscopic and nanoscopic material properties in bulk lead-free piezoceramics. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher WILEY-V C H VERLAG GMBH ko
dc.subject lead-free materials ko
dc.subject piezoceramics ko
dc.subject piezoresponse force microscopy (PFM) ko
dc.subject relaxors ko
dc.title Nanoscale Insight Into Lead-Free BNT-BT-xKNN ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84867487965 ko
dc.identifier.wosid 000309886700004 ko
dc.type.rims ART ko
dc.description.wostc 29 *
dc.description.scopustc 18 *
dc.date.tcdate 2015-05-06 *
dc.date.scptcdate 2014-10-21 *
dc.identifier.doi 10.1002/adfm.201200592 ko
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