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dc.contributor.authorLv, Xiang
dc.contributor.authorWu, Jiagang
dc.contributor.authorXiao, Dingquan
dc.contributor.authorZhu, Jianguo
dc.contributor.authorZhang, Xixiang
dc.date.accessioned2017-10-30T08:39:51Z
dc.date.available2017-10-30T08:39:51Z
dc.date.issued2017-10-20
dc.identifier.citationLv X, Wu J, Xiao D, Zhu J, Zhang X (2017) Structural evolution of the R-T phase boundary in KNN-based ceramics. Journal of the American Ceramic Society 101: 1191–1200. Available: http://dx.doi.org/10.1111/jace.15266.
dc.identifier.issn0002-7820
dc.identifier.doi10.1111/jace.15266
dc.identifier.urihttp://hdl.handle.net/10754/626030
dc.description.abstractAlthough a rhombohedral-tetragonal (R-T) phase boundary is known to substantially enhance the piezoelectric properties of potassium-sodium niobate ceramics, the structural evolution of the R-T phase boundary itself is still unclear. In this work, the structural evolution of R-T phase boundary from -150 °C to 200 °C is investigated in (0.99-x)K0.5Na0.5Nb1-ySbyO3-0.01CaSnO3-xBi0.5K0.5HfO3 (where x=0~0.05 with y=0.035, and y=0~0.07 with x=0.03) ceramics. Through temperature-dependent powder X-ray diffraction (XRD) patterns and Raman spectra, the structural evolution was determined to be Rhombohedral (R, <-125 °C) → Rhombohedral+Orthorhombic (R+O, -125 °C to 0 °C) → Rhombohedral+Tetragonal (R+T, 0 °C to 150 °C) → dominating Tetragonal (T, 200 °C to Curie temperature (TC)) → Cubic (C, >TC). In addition, the enhanced electrical properties (e.g., a direct piezoelectric coefficient (d33) of ~450±5 pC/N, a conversion piezoelectric coefficient (d33*) of ~580±5 pm/V, an electromechanical coupling factor (kp) of ~0.50±0.02, and TC~250 °C), fatigue-free behavior, and good thermal stability were exhibited by the ceramics possessing the R-T phase boundary. This work improves understanding of the physical mechanism behind the R-T phase boundary in KNN-based ceramics and is an important step towards their adoption in practical applications. This article is protected by copyright. All rights reserved.
dc.description.sponsorshipNational Science Foundation of China, Grant/Award Number: 51722208, 51332003, 51272164; King Abdullah University of Science and Technology (KAUST)
dc.publisherWiley
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1111/jace.15266/abstract
dc.rightsThis is the peer reviewed version of the following article: Structural Evolution of the R-T Phase Boundary in KNN-Based Ceramics, which has been published in final form at http://doi.org/10.1111/jace.15266. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
dc.subjectelectrical properties
dc.subjectKNN
dc.subjectR-T phase boundary
dc.subjectstructural evolution
dc.titleStructural Evolution of the R-T Phase Boundary in KNN-Based Ceramics
dc.typeArticle
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of the American Ceramic Society
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Materials Science; Sichuan University; Chengdu 610064 P. R. China
kaust.personLv, Xiang
kaust.personZhang, Xixiang
refterms.dateFOA2018-10-04T00:00:00Z
dc.date.published-online2017-10-20
dc.date.published-print2018-03


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