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

doi:10.1016/j.ceramint.2018.05.156

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

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Lead-free (K_0.5Na_0.5)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 (K_0.5Na_0.5)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: k_p：34.1% (±2%); k_t：45.3% (±2%); Q_m：3170 (±2%); R_z：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.

Original language	English
Pages (from-to)	16173-16180
Number of pages	8
Journal	Ceramics International
Volume	44
Issue number	14
DOIs	https://doi.org/10.1016/j.ceramint.2018.05.156
Publication status	Published - 2018 Oct 1

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/j.ceramint.2018.05.156

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@article{afe6883874954ad09af9214098795724,

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

abstract = "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.",

author = "Weng, \{Chung Ming\} and Tsai, \{Cheng Che\} and Hong, \{Cheng Shong\} and Chiang, \{Chung Hao\} and Chu, \{Sheng Yuan\} and Lin, \{Chun Cheng\} and Jyh Sheen",

note = "Funding Information: We gratefully acknowledge the financial support provided from the Ministry of Science and Technology (MOST), Taiwan, ROC. (Grant numbers: MOST 106-2218-E-006-023, MOST 106-2221-E-006-226, MOST 106-2622-E-006-019-CC3, MOST 106-2221-E-272-003). We would also like to thank Ms. Yu Shan Cheng (National Yang-Ming University, Taiwan) for assistance in the experiments during the preparation of this paper. Funding Information: We gratefully acknowledge the financial support provided from the Ministry of Science and Technology (MOST), Taiwan, ROC . (Grant numbers: MOST 106-2218-E-006-023 , MOST 106-2221-E-006-226 , MOST 106-2622-E-006-019-CC3 , MOST 106-2221-E-272-003 ). We would also like to thank Ms. Yu Shan Cheng (National Yang-Ming University, Taiwan) for assistance in the experiments during the preparation of this paper. Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd and Techna Group S.r.l.",

year = "2018",

month = oct,

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doi = "10.1016/j.ceramint.2018.05.156",

language = "English",

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T1 - Effects of post-annealing on electrical properties of CuF2·xH2O-doped KNN ceramics for rotary-linear ultrasonic motors

AU - Weng, Chung Ming

AU - Tsai, Cheng Che

AU - Hong, Cheng Shong

AU - Chiang, Chung Hao

AU - Chu, Sheng Yuan

AU - Lin, Chun Cheng

AU - Sheen, Jyh

N1 - Funding Information: We gratefully acknowledge the financial support provided from the Ministry of Science and Technology (MOST), Taiwan, ROC. (Grant numbers: MOST 106-2218-E-006-023, MOST 106-2221-E-006-226, MOST 106-2622-E-006-019-CC3, MOST 106-2221-E-272-003). We would also like to thank Ms. Yu Shan Cheng (National Yang-Ming University, Taiwan) for assistance in the experiments during the preparation of this paper. Funding Information: We gratefully acknowledge the financial support provided from the Ministry of Science and Technology (MOST), Taiwan, ROC . (Grant numbers: MOST 106-2218-E-006-023 , MOST 106-2221-E-006-226 , MOST 106-2622-E-006-019-CC3 , MOST 106-2221-E-272-003 ). We would also like to thank Ms. Yu Shan Cheng (National Yang-Ming University, Taiwan) for assistance in the experiments during the preparation of this paper. Publisher Copyright: © 2018 Elsevier Ltd and Techna Group S.r.l.

PY - 2018/10/1

Y1 - 2018/10/1

N2 - 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.

AB - 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.

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DO - 10.1016/j.ceramint.2018.05.156

M3 - Article

AN - SCOPUS:85050130980

SN - 0272-8842

VL - 44

SP - 16173

EP - 16180

JO - Ceramics International

JF - Ceramics International

IS - 14

ER -

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

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