Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/613
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dc.contributorDepartment of Applied Physics-
dc.creatorLin, D-
dc.creatorKwok, KW-
dc.creatorChan, HLW-
dc.date.accessioned2014-12-11T08:28:20Z-
dc.date.available2014-12-11T08:28:20Z-
dc.identifier.issn0021-8979-
dc.identifier.urihttp://hdl.handle.net/10397/613-
dc.language.isoenen_US
dc.publisherAmerican Institute of Physicsen_US
dc.rights© 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in D. Lin, K.W. Kwok, & H.L.W. Chan, J. Appl. Phys. 103, 064105 (2008) and may be found at http://link.aip.org/link/?jap/103/064105.en_US
dc.subjectCopper compoundsen_US
dc.subjectCrystal symmetryen_US
dc.subjectDensificationen_US
dc.subjectDielectric hysteresisen_US
dc.subjectFerroelectric Curie temperatureen_US
dc.subjectFerroelectric transitionsen_US
dc.subjectHardeningen_US
dc.subjectPiezoceramicsen_US
dc.subjectPiezoelectricityen_US
dc.subjectPotassium compoundsen_US
dc.subjectQ-factoren_US
dc.subjectSodium compoundsen_US
dc.subjectSolid-state phase transformationsen_US
dc.subjectVacancies (crystal)en_US
dc.titlePiezoelectric properties and hardening behavior of K[sub 5.4]Cu[sub 1.3]Ta[sub 10]O[sub 29]-doped K[sub 0.5]Na[sub 0.5]NbO₃ ceramicsen_US
dc.typeJournal/Magazine Articleen_US
dc.description.otherinformationAuthor name used in this publication: K. W. Kwoken_US
dc.description.otherinformationAuthor name used in this publication: H. L. W. Chanen_US
dc.identifier.spage1-
dc.identifier.epage5-
dc.identifier.volume103-
dc.identifier.issue6-
dcterms.abstractLead-free piezoelectric ceramics K[sub 0.5]Na[sub 0.5]NbO₃+x mol % K[sub 5.4]Cu[sub 1.3]Ta[sub 10]O[sub 29] have been prepared by a conventional ceramic fabrication technique. All the ceramics possess a perovskite structure with orthorhombic symmetry. Our results reveal that the addition of K[sub 5.4]Cu[sub 1.3]Ta[sub 10]O[sub 29] is effective in improving the densification of the ceramics. Besides, after the addition of K[sub 5.4]Cu[sub 1.3]Ta[sub 10]O[sub 29], the Curie temperature and the tetragonal-orthorhombic phase transition temperature decrease and the P-E loop becomes constricted, in particular, for the ceramic with x=0.75. Based on the symmetry-conforming principle of point defects, it is suggested that defect dipoles are formed by the acceptor dopant ions Cu[sup 2+] and O²[sup -] vacancies along the polarization direction. As a result of the low migration rate of defects, the defect dipoles remain in the original orientation during the P-E loop measurement and thus provide restoring forces to reverse the switched polarizations. Similarly, the defect dipoles do not response along with the polarization in the normal piezoelectric activities and thus provide “pinning” to the deformed polarization, making the ceramics become “hardened.” For the ceramic with x=0.75, the mechanical quality factor Q[sub m] becomes maximum at a value of 1530, while the other piezoelectric properties remain reasonably high: piezoelectric coefficient d₃₃=90 pC/N, planar and thickness mode electromechanical coupling factors k[sub p]=41 and k[sub t]=46%.-
dcterms.accessRightsopen accessen_US
dcterms.bibliographicCitationJournal of applied physics, 20 Mar. 2008, v. 103, no. 6, 064105, p. 1-5-
dcterms.isPartOfJournal of applied physics-
dcterms.issued2008-03-20-
dc.identifier.isiWOS:000254536900091-
dc.identifier.scopus2-s2.0-41549161209-
dc.identifier.eissn1089-7550-
dc.identifier.rosgroupidr36250-
dc.description.ros2007-2008 > Academic research: refereed > Publication in refereed journal-
dc.description.oaVersion of Recorden_US
dc.identifier.FolderNumberOA_IR/PIRAen_US
dc.description.pubStatusPublisheden_US
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