Multi-scale understanding the effect of K/na ratio on electrical properties of high-performance KNN-based ceramics

Yifeng Huang, Xin Wang, Yinchang Ma, Xiang Lv, Jiagang Wu

Research output: Contribution to journalArticlepeer-review


Although certain efforts were paid to the effect of K/Na ratio on the phase structure and piezoelectric properties of potassium sodium niobate {(K, Na)NbO3, KNN}-based ceramics, insufficient attention was given to the local structure and ferroelectric domains, hindering the further understanding of physical mechanisms. Herein, we studied the effect of the K/Na ratio on KNN-based ceramics with multi-phase coexistence from multi-scale structure. High Na+ content leads to local stress heterogeneity and retains large ferroelectric domains, while high K+ content rotates the NbO6 octahedron and results in local polarity heterogeneity and distinct dielectric relaxational behavior, consequently fragmenting ferroelectric domains. The improved piezoelectricity is obtained at the equal K/Na ratio and originates from the balanced local polarity and stress heterogeneities. Therefore, an appropriate K/Na ratio should be fully considered when designing compositions with the purpose of improving performance of KNN-based ceramics in the future.
Original languageEnglish (US)
JournalJournal of the American Ceramic Society
StatePublished - Sep 13 2023

Bibliographical note

KAUST Repository Item: Exported on 2023-09-18
Acknowledgements: This contribution was financially supported by the National Natural Science Foundation of China (Grant Nos. 12204327, 51972215, 52061130216, and 52032007), the Natural Science Foundation of Sichuan Province (No. 2023NSFSC0967), the Central Funds Guiding the Local Science and Technology Development of Sichuan Province (No.2021ZYD0022), and the Fundamental Research Funds for the Central Universities (No. YJ2021154). We appreciate the support from Ms. Hui Wang (Analytical and Testing Center of Sichuan University) for conducting the FE-SEM measurements.

ASJC Scopus subject areas

  • Materials Chemistry
  • Ceramics and Composites


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