Programme

I.7 -- Invited, VCTP-48

Date: Tuesday, 1 August 2023

Time: 16:00 - 16:40

Giant Electric-Field-Induced Strain in perovskite thin Films

Khuong Phuong Ong (1), Huajun Liu (2), Kui Yao (2,3) and John Wang (3,4)

(1) Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research (A*STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Republic of Singapore (2) Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, #08-03 Innovis, Singapore 138634, Republic of Singapore (3) Department of Materials Science and Engineering, National University of Singapore, Singapore 1175742, Republic of Singapore (4) NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 119077, Republic of Singapore

High-performance sensors and actuators require a large electromechanical response in materials. Normal approach to enhance electromechanical coupling is based on morphotropic phase boundaries requiring stoichiometric control of complex compositions such as in PZT materials. Such mechanism, however, has a drawback on the low Curie temperature. To go beyond this approach, we have proposed [1] a new material structure with nanopillar regions in perovskites oxides thin film NaNbO3. By this, we have achieved a giant piezoelectricity with piezoelectric coefficient, d33= 1098pm/V at 1Khz, and high Curie temperature Tc~ 4500C. In this talk, we will elucidate the mechanism of high performance piezoelectricity in perovskite NaNbO3. [1] Huajun Liu, H. Wu, Khuong P. Ong, et al., Science. 369, 292 (2020)

Presenter: Khuong Phuong Ong