Effects of post-annealing on electrical properties of CuF2·xH2O-doped KNN ceramics for rotary-linear ultrasonic motors

Chung Ming Weng, Cheng Che Tsai, Cheng Shong Hong, Chung Hao Chiang, Sheng Yuan Chu, Chun Cheng Lin, Jyh Sheen

研究成果: Article同行評審

7 引文 斯高帕斯(Scopus)

摘要

Lead-free (K0.5Na0.5)NbO3 (KNN) ceramics were prepared using a novel sintering aid (CuF2·xH2O (x ≈2)) to investigate the effects of post-annealing temperature and atmosphere on oxygen vacancies, microstructure, and electrical properties. Post-annealing (K0.5Na0.5)NbO3 + 1.5 mol% CuF2·xH2O (KNNCH) ceramics at 800 °C under argon was shown to increase the bulk relative density to 97% through the formation of a homogeneous microstructure with liquid phase. The resulting samples presented the following excellent piezoelectric properties: kp:34.1% (±2%); kt:45.3% (±2%); Qm:3170 (±2%); Rz:8.6 Ω (±3%); and tanδ:0.1%. Our results clearly demonstrate that annealing under argon can produce oxygen vacancies in ceramics, which has a significant influence on the stability of domain structures of the samples. Piezoelectric motors fabricated using these ceramics achieved a velocity of 4.5 mm/s, vertical velocity of 3.02 ·mm/s, and output power of 2.93 mW with a negligible increase in temperature and high stability while driven.

原文English
頁(從 - 到)16173-16180
頁數8
期刊Ceramics International
44
發行號14
DOIs
出版狀態Published - 2018 10月 1

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 陶瓷和複合材料
  • 製程化學與技術
  • 表面、塗料和薄膜
  • 材料化學

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