Understanding the piezoelectricity of high-performance potassium sodium niobate ceramics from diffused multi-phase coexistence and domain feature
KAUST DepartmentMaterial Science and Engineering Program
Physical Science and Engineering (PSE) Division
Embargo End Date2020-07-21
Permanent link to this recordhttp://hdl.handle.net/10754/656130
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AbstractThe understanding of high piezoelectricity in potassium sodium niobate (KNN)-based ceramics with a new phase boundary has been limited to unpoled samples. Here, the phase structure, domain structure, and phenomenological theory were studied on both unpoled and poled samples by taking (0.99 − x)(K0.48Na0.52)(Nb0.955Sb0.045)O3–0.01SrZrO3–x(Bi0.5Ag0.5)ZrO3 ceramics as an example. Shifting the phase transition temperatures to room temperature can result in the coexistence of a ferroelectric matrix containing an orthorhombic–tetragonal (O–T) coexisting phase and rhombohedral (R)-related polar nanoregions (PNRs), and then the miniature and nanoscale domain structure can be demonstrated. During the poling process, the R phase-related PNRs can facilitate domain switching and polarization rotation, resulting in a single domain structure and enhanced evidence of the R phase. Therefore, high piezoelectricity originates from a single domain feature as well as the diffused multi-phase coexistence in association with R phase related PNRs. This study provides a systematic approach to understand the physical mechanisms of enhanced piezoelectricity in KNN-based ceramics.
CitationSun, X., Zhang, J., Lv, X., Zhang, X., Liu, Y., Li, F., & Wu, J. (2019). Understanding the piezoelectricity of high-performance potassium sodium niobate ceramics from diffused multi-phase coexistence and domain feature. Journal of Materials Chemistry A, 7(28), 16803–16811. doi:10.1039/c9ta03799c
SponsorsThe authors acknowledge financial support from the National Natural Science Foundation of China (NSFC No. 517222008), the Key Technologies Research and Development Program of Sichuan Province (No. 2018JY0007), and the Undergraduate Student's Research and Innovation Fund of Sichuan University (No. 201810610075).
PublisherRoyal Society of Chemistry (RSC)
JournalJournal of Materials Chemistry A