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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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Temperature-Dependent Properties of (Bi1/2Na1/2)TiO3-(Bi1/2K1/2)TiO3-SrTiO3 Lead-Free Piezoceramics

DC Field Value Language
dc.contributor.author Wang, Ke ko
dc.contributor.author Hussain, Ali ko
dc.contributor.author Jo, Wook ko
dc.contributor.author Roedel, Juergen ko
dc.date.available 2014-10-21T08:34:47Z -
dc.date.created 2014-10-21 ko
dc.date.issued 2012-07 -
dc.identifier.citation JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.95, no.7, pp.2241 - 2247 ko
dc.identifier.issn 0002-7820 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/7535 -
dc.identifier.uri http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84863723157 ko
dc.description.abstract Ferroelectric and piezoelectric properties of SrTiO3modified (0, 3, and 5 mol%) 0.8Bi1/2Na1/2TiO30.2Bi1/2K1/2TiO3 lead-free piezoceramics were investigated as a model system in an attempt to lay a guideline for developing lead-free piezoelectric materials with large strains. Two guidelines, one for the choice of base composition and the other for the choice of chemical modifiers, were assumed from our current understanding of the mechanism involved. Dielectric permittivity of both poled and unpoled samples was measured and compared, leading to a conclusion that the frequency-independent anomaly (TF-R) is the temperature at which induced-ferroelectric order converts back to relaxor state. The correlation between TF-R and depolarization temperature (Td) was shown by the comparison with Td determined by thermally stimulated depolarization current measurements, whereas the ferroelectric-relaxor transition temperature TF-R was determined using poled samples. A large unipolar strain of 0.36% (Smax/Emax = 600 pm/V) at a driving field of 6 kV/mm was obtained at room temperature for a SrTiO3 content of 5 mol%. Temperature-dependent measurements of both polarization and strain from room temperature to 200 degrees C revealed that the origin of the large strain is due to a reversible field-induced ergodic relaxor-to-ferroelectric phase transformation. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher WILEY-BLACKWELL ko
dc.subject Base composition ko
dc.subject Chemical modifiers ko
dc.subject Depolarization temperature ko
dc.subject Dielectric permittivities ko
dc.subject Driving field ko
dc.subject Ergodics ko
dc.subject Ferroelectric and piezoelectric properties ko
dc.subject Field-induced ko
dc.subject Large strains ko
dc.subject Lead free piezoceramics ko
dc.subject Lead-free piezoelectric materials ko
dc.subject Model system ko
dc.subject Poled sample ko
dc.subject Relaxors ko
dc.subject Room temperature ko
dc.subject SrTiO ko
dc.subject Temperature-dependent measurements ko
dc.subject Temperature-dependent properties ko
dc.subject Thermally stimulated depolarization currents ko
dc.subject TiO ko
dc.title Temperature-Dependent Properties of (Bi1/2Na1/2)TiO3-(Bi1/2K1/2)TiO3-SrTiO3 Lead-Free Piezoceramics ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84863723157 ko
dc.identifier.wosid 000306080900029 ko
dc.type.rims ART ko
dc.description.wostc 53 *
dc.description.scopustc 40 *
dc.date.tcdate 2015-05-06 *
dc.date.scptcdate 2014-10-21 *
dc.identifier.doi 10.1111/j.1551-2916.2012.05162.x ko
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