Stable Ferroelectric Perovskite Structure with Giant Axial Ratio and Polarization in Epitaxial BiFe0.6Ga0.4O3 Thin Films

被引：38

作者：

Fan, Zhen ^{[1
]}

Xiao, Juanxiu ^{[3
]}

Liu, Huajun ^{[1
]}

Yang, Ping ^{[4
]}

Ke, Qingqing ^{[1
]}

Ji, Wei ^{[2
]}

Yao, Kui ^{[2
]}

Ong, Khuong P. ^{[5
]}

Zeng, Kaiyang ^{[3
]}

Wang, John ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117575, Singapore

[2] ASTAR, Inst Mat Res & Engn, Singapore 117602, Singapore

[3] Natl Univ Singapore, Dept Mech Engn, Singapore 117575, Singapore

[4] Natl Univ Singapore, Singapore Synchrotron Light Source, Singapore 117603, Singapore

[5] Inst High Performance Comp, Mat Sci & Engn Dept, Singapore 138632, Singapore

来源：

ACS APPLIED MATERIALS & INTERFACES | 2015年 / 7卷 / 04期

关键词：

BiFeO3; supertetragonal; giant polarization; epitaxial thin film; ferroelectric; TETRAGONAL BIFEO3; PHASE;

D O I：

10.1021/am509016w

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Ferroelectric perovskites with strongly elongated unit cells (c/a > 1.2) are of particular interest for realizing giant polarization induced by significant ionic off-center displacements. Here we show that epitaxial BiFe0.6Ga0.4O3 (BFGO) thin films exhibit a stable super-tetragonal-like structure with twinning domains regardless of film thickness and substrate induced strain, evidenced with high resolution X-ray diffractometry (HR-XRD), transmission electron microscopy (TEM) and piezoresponse force microscopy (PFM). The origin of the structural stability of BFGO is investigated by the first-principles calculation. The ferroelectric properties of BFGO are studied by PFM, first-principles calculation and macroscopic polarization-electric field (P-E) hysteresis measurement. A giant ferroelectric polarization of similar to 150 mu C/cm(2) is revealed by the first-principles calculations and confirmed by experiments. Our studies provide an alternative pathway of employing Ga-substitution other than the extensively studied strain engineering to stabilize the supertetragonal structure in BiFeO3-based epitaxial thin films.

引用

页码：2648 / 2653

页数：6

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