Hysteresis-free piezoresponse in thermally strained ferroelectric barium titanate films

0552304 - FZÚ 2022 RIV CH eng J - Journal Article
Tyunina, Marina - Mikšovský, Jan - Kocourek, Tomáš - Dejneka, Alexandr
Hysteresis-free piezoresponse in thermally strained ferroelectric barium titanate films.
Electronic materials. Roč. 2, č. 1 (2021), s. 17-23. E-ISSN 2673-3978
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA19-09671S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : barium titanate * piezoelectric * ferroelectric
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Method of publishing: Open access

Modern technology asks for thin films of sustainable piezoelectrics, whereas electro- mechanical properties of such films are poorly explored and controlled. Here, dynamic and quasi- static polarization, dielectric, and piezoelectric responses were experimentally studied in thin-film stacks of barium titanate sandwiched between electrodes and grown on top of strontium titanate sub- strate. Accurate piezoelectric characterization was secured by using double beam interferomet- ric technique. All out-of-plane responses were found to be hysteresis-free. Effective piezoelectric coefficient ~50 pm/V and linear strain-voltage characteristic were achieved. The observed behavior was ascribed to field induced out-of-plane polarization, whereas spontaneous polarization is in-plane due to in-plane tensile thermal strain.
Permanent Link: http://hdl.handle.net/11104/0327436