Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

Authors

Norihiro Suzuki, National Institute for Materials Science, Tokyo University of Science
Minoru Osada, National Institute for Materials Science
Md Motasim Billah, University of Wollongong, National Institute for Materials ScienceFollow
Yoshio Bando, University of Wollongong, National Institute for Materials ScienceFollow
Yusuke Yamauchi, University of Queensland, Kyung Hee UniversityFollow
Md. Shahriar Al Hossain, University of Wollongong, National Institute for Materials ScienceFollow

RIS ID

125549

Publication Details

Suzuki, N., Osada, M., Billah, M., Bando, Y., Yamauchi, Y. & Hossain, S. A. (2018). Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain. Journal of Visualized Experiments, 2018 (133), e57441-1-e57441-7.

Abstract

Barium titanate (BaTiO 3 , hereafter BT) is an established ferroelectric material first discovered in the 1940s and still widely used because of its well-balanced ferroelectricity, piezoelectricity, and dielectric constant. In addition, BT does not contain any toxic elements. Therefore, it is considered to be an eco-friendly material, which has attracted considerable interest as a replacement for lead zirconate titanate (PZT). However, bulk BT loses its ferroelectricity at approximately 130 °C, thus, it cannot be used at high temperatures. Because of the growing demand for high-temperature ferroelectric materials, it is important to enhance the thermal stability of ferroelectricity in BT. In previous studies, strain originating from the lattice mismatch at hetero-interfaces has been used. However, the sample preparation in this approach requires complicated and expensive physical processes, which are undesirable for practical applications. In this study, we propose a chemical synthesis of a porous material as an alternative means of introducing strain. We synthesized a porous BT thin film using a surfactant-assisted sol-gel method, in which self-assembled amphipathic surfactant micelles were used as an organic template. Through a series of studies, we clarified that the introduction of pores had a similar effect on distorting the BT crystal lattice, to that of a hetero-interface, leading to the enhancement and stabilization of ferroelectricity. Owing to its simplicity and cost effectiveness, this fabrication process has considerable advantages over conventional methods.