报告人：Dae-Yong Jeong
单位：Department of Materials Science and Engineering, Inha University, Incheon, Republic of Korea
报告时间：2026年4月3日（星期五）上午11:00
报告地点：知新楼C座702量子报告厅
邀请人：王春明
个人简介：
Professor Dae-Yong Jeong currently serves as the Dean of the Graduate School of Engineering and a Professor in the Department of Materials Science and Engineering at Inha University in Korea.
He began his academic journey at Seoul National University, where he earned both his BS and MS degrees, followed by a period of industrial experience within Korea. He later transitioned to the United States for his doctoral studies, receiving his Ph.D. from Pennsylvania State University in 2004 with a focus on relaxor ferroelectric properties and their practical device applications.
His professional career is marked by significant international experience, including research roles at TRS Technologies in the USA and the Research Institute of Electrical Communication (RIEC) at Tohoku University in Japan. Upon returning to Korea, he contributed his expertise as a senior researcher at the Korea Institute of Science and Technology (KIST) and as an assistant professor at Myongji University. Since joining the faculty at Inha University in September 2011, Professor Jeong has dedicated his research to energy harvesting, ferroelectrics, nano-engineering for materials development, high-energy density capacitors, and piezoelectric devices. Beyond his technical research, he is deeply committed to advancing innovative engineering education and the strategic development of intellectual properties.
报告摘要：
Pb(Zr0.52Ti0.48)O3 (PZT) is well known ferroelectric material and has been intensively studied and used for various applications. For energy storage capacitor application, normal ferroelectric has several drawbacks such as low breakdown field and poor charging/discharging efficiency due to large hysteresis. Low breakdown field of crystalline PZT of ordered phase can be mitigated by introducing the disordered phase to form a mixture composite. High efficiency for energy charging-discharging can be realized by making large hysteresis into slim shape. Here, a novel nanograin engineering approach based upon high kinetic energy deposition is reported, for mechanically inducing the relaxor ferroelectric behavior in the mixture of ordered and disordered PZT, which is composited of the same composition and results in simultaneous enhancement in the dielectric breakdown strength and high efficiency. Aerosol deposited thick films with 4 μm thickness exhibit an exceptional breakdown field of 540 MV/m and reduced hysteresis with energy-storage density of 124.1 J/cm3 and a power density of 64.5 MW/cm3. This approach is correlated with the generalized nanostructure design that comprises nano-size ordered phases embedded within the disordered matrix.
References
[1] J. Ryu and D.-Y. Jeong et al., Adv. Mater, 35(45), 2302554, 2023.
