Jing-Feng Li - Lead-Free Piezoelectric Materials

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Jing‐Feng Li

Author

Jing‐Feng LiTsinghua University Materials Science and Engineering No. 30 Shuangqing Road Haidian District 100084 Beijing China

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Print ISBN:978‐3‐527‐34512‐0 ePDF ISBN:978‐3‐527‐81707‐8 ePub ISBN:978‐3‐527‐81705‐4 oBook ISBN:978‐3‐527‐81704‐7

Jing‐Feng Liis Changjiang scholar distinguished professor of the School of Materials Science and Engineering at Tsinghua University, Beijing, China, and also serves as deputy director of Tsinghua University‐Toyota Research Center. Dr. Li has received master and doctor degrees in materials science and engineering both from Tohoku University (Japan) in 1988 and 1991 and a bachelor of engineering from Huazhong University of Science and Technology, China, in 1984. After temporarily working at Nihon Ceratec Co. Ltd., he was appointed to assistant professor in Tohoku University in 1992 and promoted to associate professor in 1997, then joined Tsinghua University as full professor in 2002. He also served as vice department chair (2005–2012) and vice school dean (2013–2016) of Materials of Materials Science and Engineering Department/School at Tsinghua University.

Dr. Li has conducted a wide range of research. His early work in Tohoku University focused on phase transition of zirconia ceramics, ceramic processing, and mechanical properties of silicon carbide and aluminum nitride ceramics, and ceramic microfabrication processing. From 2002 at Tsinghua, Li has been leading a research group with research interests on lead‐free ferroelectric ceramics for piezoelectric and energy storage applications, piezoelectric films for microelectromechanical system (MEMS) applications, thermoelectric materials, and microdevices for energy conversion, MEMS‐based microfabrication processing. He has published >490 papers (H‐index = 67) in prestigious journals and received several awards including distinguished young researcher award from the Japan Institute of Metals and the first‐class science and technology award from the Chinese Ceramic Society, distinguished young scholars fund from National Natural Science Foundation of China, Journal of the American Ceramic Society Loyalty Award.

He serves as Editor‐in‐Chief of Journal of Materiomics, associate Editor‐in‐Chief for Journal of the Chinese Ceramic Society, Reginal/Subject Editor for Journal of Materials Processing Technology (2005–2013), and editorial board member for NPG Asia Materials, Journal of Advanced Ceramics, Journal of Asian Ceramic Societies, Science China Technological Science, Energy Harvesting and Systems, Journal of Inorganic Materials, Electronic Components and Materials (Chinese), Powder Metallurgy Technology (Chinese). He has been elected to the President of Thermoelectric Materials and Applications Subsociety of Chinese Materials Research Society and Vice President of Micro/Nano Technology Subsociety of Chinese Ceramic Society in 2018. He is a fellow of the American Ceramic Society, board member of International Thermoelectric Society, full member of International Institute for the Science of Sintering, and ferroelectric committee member of IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society.

Piezoelectric materials possess the functionality of interconversion between electrical energy and mechanical energy, which have been widely used in electronic information, communication, automobile, military defense, aeronautics and space technology, medical diagnostics, energy storage and harvesting, artificial intelligence, and advanced manufacturing, among other applications. The market‐dominating piezoelectric ceramics are based on the Pb(Zr,Ti)O 3(abbreviated as PZT) system, which is a big family with diverse chemical modifications designed for specific applications. PZT‐based ceramics possess comprehensive excellent properties, but its environmental incompatibility has generated increasing concerns since the beginning of the twenty‐first century. In addition, the European Union's legislation about Restriction of the use of certain Hazardous Substances (RoHS) in electrical and electronic equipment has accelerated the research and development of high‐performance lead‐free piezoelectric ceramics.

Piezoelectric ceramics and device applications have been one of the key research directions in the State‐Key Laboratory of New Ceramics and Fine Processing, Tsinghua University. At Tsinghua University, our research groups mainly focused on lead‐based piezoelectric ceramics and their applications before the twenty‐first century. Since the new century I became deeply interested in lead‐free piezoelectrics and have been heavily involved in the related research activities with several research groups within our state‐key laboratory. Among them, Prof. Jing‐Feng Li is the leader of the biggest research group working on lead‐free piezoelectric ceramics since 2002 when he moved to Tsinghua University from Tohoku University. With the financial support from the National Natural Science Foundation and the Ministry of Science and Technology of China, Tsinghua University and Toyota Motor Corporation, Prof. Jing‐Feng Li has been focusing on the (K,Na)NbO 3lead‐free piezoelectric system and made substantial progress in numerous research areas, including sintering process, characterization and manipulation of hierarchical structure, chemical modification, and piezoelectricity enhancement mechanism, etc. Because of these impressive achievements, he has received the first‐class science and technology award from the Chinese Ceramic Society. Meanwhile, a start‐up company was also founded by his former students quite recently to promote the mass production and industrial applications of the high‐performance (K,Na)NbO 3‐based piezoceramics.