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

Abstract

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
DOIs
StatePublished - Sep 13 2023

ASJC Scopus subject areas

  • Materials Chemistry
  • Ceramics and Composites

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