Abstract
Although past studies have shown a competitive relationship between bismuth ion (Bi3+) and rare earth ions in potassium sodium niobate {(K, Na)NbO3, KNN}-based ceramics, a comprehensive investigation of this competition has been relatively scarce. Herein, we conducted an in-depth exploration of this competition by substituting Bi3+ with praseodymium ions (Pr3+) in KNN-based ceramics possessing high piezoelectric properties. The substitution of Bi3+ with Pr3+ results in a decrease in the extent of multi-phase coexistence at room temperature, an increase in domain size and grain size, and the enhancement of ferroelectricity. However, it also leads to a deterioration in piezoelectricity. Through a combination of experimental findings and first-principles calculations, we analyzed the alterations in phase structure, ferroelectric domains, and electrical properties, attributing these changes to the competitive nature of Bi-O and Pr-O bonds with their distinct ionic/covalent characteristics. Consequently, this study not only unveils the underlying physical mechanism behind the competition between Bi3+ and Pr3+ ions in KNN-based piezoceramics but also presents a novel approach to tailor the phase transition temperature, thereby facilitating the overall performance improvement of KNN-based ceramics.
Original language | English (US) |
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Pages (from-to) | 1127-1136 |
Number of pages | 10 |
Journal | Journal of the American Ceramic Society |
Volume | 107 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2024 |
Keywords
- A-site doping ions
- electronegativity
- lead-free piezoelectric
- potassium sodium niobate
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry