Coupling effects of the A-site ions on high-performance potassium sodium niobate ceramics

Xiang Lv, Nan Zhang, Yinchang Ma, Xixiang Zhang, Jiagang Wu

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Although vast efforts have been given to the phase boundary engineering (PBE) of potassium sodium niobate (KNN) ceramics by using chemical dopants, the inherent issues like the K/Na ratio were not paid enough attention, hindering the further understanding of physical mechanisms. Herein, we investigated the effect of the K/Na ratio on PBE-featured KNN-based ceramics. The K/Na ratio significantly influences the local A-site environment and thereby alters mesoscopic ferroelectric domains and macroscopic structure and performance. A much higher Na+ content results in the local stress heterogeneity, while a much higher K+ content brings in the local polar heterogeneity. Due to the appropriate coupling between the local stress and the polar heterogeneity, piezoelectric properties and the temperature stability of electro-strain are optimized on the Na-rich side. Therefore, beyond seeking appropriate chemical dopants, elaborately tailoring the K/Na ratio is also important for further improving the piezoelectric properties of PBE-featured KNN-based ceramics.
Original languageEnglish (US)
Pages (from-to)198-207
Number of pages10
JournalJournal of Materials Science & Technology
Volume130
DOIs
StatePublished - Jun 15 2022

Bibliographical note

KAUST Repository Item: Exported on 2022-06-17
Acknowledgements: This work was supported by the National Natural Science Foundation of China (Nos. 52061130216, 52032007, and 52002252), the Central Funds Guiding the Local Science and Technology Development of Sichuan Province (2021ZYD0022), the Fundamental Research Funds for the Central Universities (YJ2021154), and Chengdu International Science and Technology Cooperation Project (2021-GH03-00003-HZ). The Royal Society is appreciated for a Newton Advanced Fellowship award (NAF\R1\201126). We appreciate the support from Ms. Hui Wang (Analytical & Testing Center of Sichuan University) for conducting the FE-SEM measurements.

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics
  • Mechanics of Materials
  • Metals and Alloys
  • Ceramics and Composites
  • Mechanical Engineering

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