Stable self-polarization in lead-free Bi(Fe0.93Mn0.05Ti0.02)O3 thick films
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Published:2022-12
Issue:06
Volume:12
Page:
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ISSN:2010-135X
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Container-title:Journal of Advanced Dielectrics
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language:en
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Short-container-title:J. Adv. Dielect.
Author:
Fan Mengjia1,
Bu Xinyu1,
Wang Wenxuan1,
Sun Wei1,
Lin Xiujuan1,
Huang Shifeng1,
Yang Changhong1ORCID
Affiliation:
1. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, P. R. China
Abstract
The BiFeO3-based film is one of the most promising candidates for lead-free piezoelectric film devices. In this work, the 1 [Formula: see text]m-thick Bi([Formula: see text][Formula: see text][Formula: see text])O3 (BFMT) films are grown on the ITO/glass substrate using a sol-gel method combined with spin-coating and layer-by-layer annealing technique. These films display a large saturated polarization of 95 [Formula: see text]C/cm2, and a remanent polarization of 70 [Formula: see text]C/cm2. Especially, the films are self-poled caused by an internal bias field, giving rise to asymmetric polarization-electric field ([Formula: see text]) loops with a positive shift along the [Formula: see text]-axis. A stable self-polarization state is maintained during the applied electric field increasing to 1500 kV/cm and then decreasing back. The weak dependence of [Formula: see text] loops on frequency (1–50 kHz) and temperature (25–125[Formula: see text]C) indicate that the internal bias field can be stable within a certain frequency and temperature range. These results demonstrate that the self-polarized BFMT thick films can be integrated into devices without any poling process, with promising applications in micro-electro-mechanical systems.
Funder
National Natural Science Foundation of China
Shandong Provincial Natural Science Foundation
Project of “20 Items of University” of Jinan
Introduction Program of Senior Foreign Experts
Publisher
World Scientific Pub Co Pte Ltd
Subject
Electrical and Electronic Engineering,Condensed Matter Physics,Ceramics and Composites,Electronic, Optical and Magnetic Materials