Design, synthesis, microstructure and electrical properties of thermal-strained PZT films. Issue 11 (September 2021)

• Record Type: Journal Article
• Authors: Er, Xiaokuo; Shao, Fei; Diao, Sizhe; Wang, Hongliang; Ma, Qinghua; Liu, Pingping; Zhang, Jinxing; Zhan, Qian
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 11(2021)
• Page Start: 5512
• Page End: 5518
• Publication Date: 2021-09
• Subjects: Microstructure -- Electrical performance -- PbZr0.52Ti0.48O3 -- Heat-resistant steel -- Thermal strain; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2021.04.023
• Languages: English
• ISSNs: 0955-2219

Abstract

Highlights: A large in-plane compressive stress was obtained in the PZT films due to the thermal expansion mismatch of about 88.2 % between the thin films and the steel substrates, which intensifies the orientation of the films toward c-axis. Elemental distribution mapping revealed that a metal-oxide bi-layer in the form of Fe-oxide/Cr-oxide was formed at the interface between the LNO buffer layer and steel substrate and no diffusion or undesired reaction was observed at the PZT/LNO interface. The sub-10 nm 90° nanodomains were found to be alternately distributed observed along the [001] direction, and the motion of the nanoscale ferroelastic 90° domains is beneficial to the piezoelectric performance. A large remnant polarization (Pr) of ～67.3μC/cm 2 were obtained in the PZT film. Abstract: The integration units with functional and structural material components have been developed largely recently. In the present study, 200 nm-thick polycrystalline PbZr0.52 Ti0.48 O3 (PZT) films with a dense columnar structure were grown on LaNiO3 (LNO) buffered heat-resistant steel substrates via a low-cost chemical solution approach. The behavior of the functional PZT films when combined with the structural steel was investigated mainly by TEM and electrical measurement. A large in-plane compressive stress was obtained in the PZT films due to the thermal expansion mismatch of about 88.2 % between the thin films and the steel substrates, which intensifies the orientation of the films toward c-axis. Sub-10 nm 90° nanodomains were alternately distributed in [001] grains which is beneficial to the piezoelectric performance, and the equivalent d33 value is ～44.4 pm V −1 . A remnant polarization (Pr ) of ～67.3μC/cm 2 and a dielectric constant of ～425 were obtained. The enhanced electrical properties are associated with the stress-induced improved c-axis spontaneous polarization and crystal orientation in the hybrid system. This work may provide a theoretical basis for further integrating functional elements into metallic materials, which is valuable for covering the gap between academic research and industrial mass production.