Structural Evolution of the R-T Phase Boundary in KNN-Based Ceramics

Handle URI:
http://hdl.handle.net/10754/626030
Title:
Structural Evolution of the R-T Phase Boundary in KNN-Based Ceramics
Authors:
Lv, Xiang; Wu, Jiagang; Xiao, Dingquan; Zhu, Jianguo; Zhang, Xixiang ( 0000-0002-3478-6414 )
Abstract:
Although 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.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program
Citation:
Lv 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.
Publisher:
Wiley-Blackwell
Journal:
Journal of the American Ceramic Society
Issue Date:
4-Oct-2017
DOI:
10.1111/jace.15266
Type:
Article
ISSN:
0002-7820
Sponsors:
National Science Foundation of China, Grant/Award Number: 51722208, 51332003, 51272164; King Abdullah University of Science and Technology (KAUST)
Additional Links:
http://onlinelibrary.wiley.com/doi/10.1111/jace.15266/abstract
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorLv, Xiangen
dc.contributor.authorWu, Jiagangen
dc.contributor.authorXiao, Dingquanen
dc.contributor.authorZhu, Jianguoen
dc.contributor.authorZhang, Xixiangen
dc.date.accessioned2017-10-30T08:39:51Z-
dc.date.available2017-10-30T08:39:51Z-
dc.date.issued2017-10-04en
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.en
dc.identifier.issn0002-7820en
dc.identifier.doi10.1111/jace.15266en
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.en
dc.description.sponsorshipNational Science Foundation of China, Grant/Award Number: 51722208, 51332003, 51272164; King Abdullah University of Science and Technology (KAUST)en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1111/jace.15266/abstracten
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.en
dc.subjectelectrical propertiesen
dc.subjectKNNen
dc.subjectR-T phase boundaryen
dc.subjectstructural evolutionen
dc.titleStructural Evolution of the R-T Phase Boundary in KNN-Based Ceramicsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.identifier.journalJournal of the American Ceramic Societyen
dc.eprint.versionPost-printen
dc.contributor.institutionDepartment of Materials Science; Sichuan University; Chengdu 610064 P. R. Chinaen
kaust.authorLv, Xiangen
kaust.authorZhang, Xixiangen
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