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

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

ASJC Scopus subject areas

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

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