Fabrication of (K,Na)NbO<sub>3</sub>-based composite lead-free piezoelectric ceramics and their high-power properties
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- Hirose Yoshinobu
- NGK Spark Plug Co., Ltd.
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- Maruyama Koji
- NGK Spark Plug Co., Ltd.
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- Kimura Takeshi
- NGK Spark Plug Co., Ltd.
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- Kitamura Kazuaki
- NGK Spark Plug Co., Ltd.
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- Yamada Hideto
- NGK Spark Plug Co., Ltd.
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- Kurahashi Toshiaki
- NGK Spark Plug Co., Ltd.
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- Kasashima Takashi
- NGK Spark Plug Co., Ltd.
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- Kozuka Hisashi
- NGK Spark Plug Co., Ltd.
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- Yamazaki Masato
- NGK Spark Plug Co., Ltd.
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- Okimura Yasuyuki
- NGK Spark Plug Co., Ltd.
Description
<p>Mn-added (K,Na)NbO3-based composite lead-free piezoelectric ceramic containing KTiNbO5 phase was fabricated for potential application to high-power fields. The resulting (K,Na)NbO3-based composite ceramic with 2 mol % MnO2 exhibited piezoelectric properties (mechanical quality factor Qm = 650, piezoelectric constant d33 = 140 pC/N, electromechanical coupling coefficient kp = 0.42, dielectric constant ε33T/ε0 = 750, dielectric loss tan δ = 0.5 %), and adequate heat resistance (Curie temperature Tc = 320 °C). It exhibited an internal electric field, as indicated by a shift of the polarization–electric field hysteresis loop in the direction of the electric field. High-power characteristics of bolt-clamped Langevin transducers prepared using the (K,Na)NbO3-based composite ceramic was superior to those of a Pb(Zr,Ti)O3 ceramic at a vibration velocity under high input voltage. The (K,Na)NbO3-based composite ceramic has good high-power properties and adequate heat resistance, dense microstructure, and process stability, and is considered to be a promising candidates as lead-free piezoelectric ceramics for high-power devices, such as ultrasonic motors, transformers, and transducers.</p>
Journal
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- Journal of the Ceramic Society of Japan
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Journal of the Ceramic Society of Japan 131 (7), 248-251, 2023-07-01
The Ceramic Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390859616450548352
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- ISSN
- 13486535
- 18820743
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
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- Abstract License Flag
- Disallowed