(K, Na)Nbo 3   Lead-Free Piezoceramics Prepared by Microwave Sintering and Solvothermal Powder Synthesis

17 Pages Posted: 23 Apr 2022

See all articles by Li Haitao

Li Haitao

Henan University of Science and Technology

Hao Yijin

University of Science and Technology Beijing

Lin Zihan

Henan University of Science and Technology

He Xinyun

Henan University of Science and Technology

Cai Jiaqi

Henan University of Science and Technology

Gong Xintai

Henan University of Science and Technology

Yongjun Gu

Henan University of Science and Technology

Zhang Rui

University of Science and Technology Beijing

Hao Hu

Henan University of Science and Technology

Bo-Ping Zhang

University of Science and Technology Beijing

Abstract

Low temperature and short processing time are benefical for fabricating (K, Na)NbO 3 (KNN) lead-free piezoelectric ceramics with a drawback of easy alkali metal volatilization during the powder synthesis and sintering processes. This study revealed that microwave sintering in addition to microwave solvothermal powder synthesis can lead to short-time fabrication of KNN ceramics with high density and fine grains. It was found that KNN powder with a single perovskite structure can be synthesized successfully by microwave solvothermal method if the KOH/NaOH concentration exceeds 1 M, which can be densified by microwave sintering to a high relative density close to 97% at 1050 o C even using 2/9 shorter soak time than normal sintering at the same temperature. Importantly, the microwave-sintered KNN ceramics show better piezoelectric and ferroelectric properties than that by normal sintering. Despite nonexistence of any dopants, a high-level piezoelectric coefficient ( d 33 ) reaching 132 pC/N was obtained in the MS-processed pure KNN ceramics that also possess better ferroelectric properties with a high remnant polarization ( P r ) up to 26.3 µC/cm 2 . The present work indicate that the microwave solvothermal method is a promising method for preparing KNN-based ceramics.

Keywords: Potassium sodium niobate, Lead-free piezoelectric ceramics, Microwave solvothermal synthesis, Microwave sintering

Suggested Citation

Haitao, Li and Yijin, Hao and Zihan, Lin and Xinyun, He and Jiaqi, Cai and Xintai, Gong and Gu, Yongjun and Rui, Zhang and Hu, Hao and Zhang, Bo-Ping, (K, Na)Nbo 3   Lead-Free Piezoceramics Prepared by Microwave Sintering and Solvothermal Powder Synthesis. Available at SSRN: https://ssrn.com/abstract=4091243 or http://dx.doi.org/10.2139/ssrn.4091243

Li Haitao (Contact Author)

Henan University of Science and Technology ( email )

263 Kaiyuan Ave, Luolong Qu
Luoyang Shi
China

Hao Yijin

University of Science and Technology Beijing ( email )

30 Xueyuan Road, Haidian District
beijing, 100083
China

Lin Zihan

Henan University of Science and Technology ( email )

263 Kaiyuan Ave, Luolong Qu
Luoyang Shi
China

He Xinyun

Henan University of Science and Technology ( email )

263 Kaiyuan Ave, Luolong Qu
Luoyang Shi
China

Cai Jiaqi

Henan University of Science and Technology ( email )

263 Kaiyuan Ave, Luolong Qu
Luoyang Shi
China

Gong Xintai

Henan University of Science and Technology ( email )

263 Kaiyuan Ave, Luolong Qu
Luoyang Shi
China

Yongjun Gu

Henan University of Science and Technology ( email )

263 Kaiyuan Ave, Luolong Qu
Luoyang Shi
China

Zhang Rui

University of Science and Technology Beijing ( email )

30 Xueyuan Road, Haidian District
beijing, 100083
China

Hao Hu

Henan University of Science and Technology ( email )

263 Kaiyuan Ave, Luolong Qu
Luoyang Shi
China

Bo-Ping Zhang

University of Science and Technology Beijing ( email )

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