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dc.contributor.authorLv, Xiang
dc.contributor.authorWu, Jiagang
dc.contributor.authorZhu, Jianguo
dc.contributor.authorXiao, Dingquan
dc.contributor.authorZhang, Xixiang
dc.date.accessioned2018-05-14T13:37:07Z
dc.date.available2018-05-14T13:37:07Z
dc.date.issued2018-04-23
dc.identifier.citationLv X, Wu J, Zhu J, Xiao D, Zhang X (2018) Temperature stability and electrical properties in La-doped KNN-based ceramics. Journal of the American Ceramic Society. Available: http://dx.doi.org/10.1111/jace.15695.
dc.identifier.issn0002-7820
dc.identifier.doi10.1111/jace.15695
dc.identifier.urihttp://hdl.handle.net/10754/627865
dc.description.abstractTo improve the temperature stability and electrical properties of KNN-based ceramics, we simultaneously consider the phase boundary and the addition of rare earth element (La), 0.96K0.5Na0.5Nb0.96Sb0.04O3-0.04(Bi1-xLax)0.5Na0.5ZrO3 (0 ≤ x ≤ 1.0) ceramics. More specifically, we investigate how the phase boundary and the addition of La3+ affect the phase structure, electrical properties, and temperature stability of the ceramic. We show that increasing the La3+ content leads to a change in phase structure, from a rhombohedral-tetragonal (R-T) phase coexistence to a cubic phase. More importantly, we show that the appropriate addition of La3+ (x = 0.2) can simultaneously improve the unipolar strain (from 0.127% to 0.147%) and the temperature stability (i.e., the unipolar strain of 0.147% remains unchanged when T is increased from 25 to 80°C). In addition, we find that the ceramics with x = 0.2 exhibit a large piezoelectric constant (d33) of ~430 pC/N, a high Curie temperature (TC) of ~240°C and a fatigue-free behavior (after 106 electric cycles). The enhanced electrical properties mostly originate from the easy domain switching, whereas the improved temperature stability can be attributed to the R-T phase boundary and the appropriate addition of La3+.
dc.description.sponsorshipAuthors gratefully acknowledge the support of the National Natural Science Foundation of China (NSFC Nos. 51722208 and 51332003) and the Fundamental Research Funds for the Central Universities (2012017yjsy111). Authors thank Mrs. Wang Hui (Analytical & Testing Center of Sichuan University) for performing the FE-SEM measurements.
dc.publisherWiley
dc.relation.urlhttps://onlinelibrary.wiley.com/doi/abs/10.1111/jace.15695
dc.titleTemperature stability and electrical properties in La-doped 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.contributor.institutionDepartment of Materials Science; Sichuan University; Chengdu China
kaust.personLv, Xiang
kaust.personZhang, Xixiang
dc.date.published-online2018-04-23
dc.date.published-print2018-09


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