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Stable ferroelectric perovskite structure with giant axial ratio and polarization in epitaxial BiFe0.6Ga0.4O3 thin films.
ACS Appl Mater Interfaces 2015; 7(4):2648-53AA

Abstract

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 ∼150 μC/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.

Authors+Show Affiliations

Department of Materials Science and Engineering, National University of Singapore , 9 Engineering Drive 1, Singapore 117575, Singapore.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25568932

Citation

Fan, Zhen, et al. "Stable Ferroelectric Perovskite Structure With Giant Axial Ratio and Polarization in Epitaxial BiFe0.6Ga0.4O3 Thin Films." ACS Applied Materials & Interfaces, vol. 7, no. 4, 2015, pp. 2648-53.
Fan Z, Xiao J, Liu H, et al. Stable ferroelectric perovskite structure with giant axial ratio and polarization in epitaxial BiFe0.6Ga0.4O3 thin films. ACS Appl Mater Interfaces. 2015;7(4):2648-53.
Fan, Z., Xiao, J., Liu, H., Yang, P., Ke, Q., Ji, W., ... Wang, J. (2015). Stable ferroelectric perovskite structure with giant axial ratio and polarization in epitaxial BiFe0.6Ga0.4O3 thin films. ACS Applied Materials & Interfaces, 7(4), pp. 2648-53. doi:10.1021/am509016w.
Fan Z, et al. Stable Ferroelectric Perovskite Structure With Giant Axial Ratio and Polarization in Epitaxial BiFe0.6Ga0.4O3 Thin Films. ACS Appl Mater Interfaces. 2015 Feb 4;7(4):2648-53. PubMed PMID: 25568932.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Stable ferroelectric perovskite structure with giant axial ratio and polarization in epitaxial BiFe0.6Ga0.4O3 thin films. AU - Fan,Zhen, AU - Xiao,Juanxiu, AU - Liu,Huajun, AU - Yang,Ping, AU - Ke,Qingqing, AU - Ji,Wei, AU - Yao,Kui, AU - Ong,Khuong P, AU - Zeng,Kaiyang, AU - Wang,John, Y1 - 2015/01/21/ PY - 2015/1/9/entrez PY - 2015/1/9/pubmed PY - 2015/1/9/medline KW - BiFeO3 KW - epitaxial thin film KW - ferroelectric KW - giant polarization KW - supertetragonal SP - 2648 EP - 53 JF - ACS applied materials & interfaces JO - ACS Appl Mater Interfaces VL - 7 IS - 4 N2 - 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 ∼150 μC/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. SN - 1944-8252 UR - https://www.unboundmedicine.com/medline/citation/25568932/Stable_ferroelectric_perovskite_structure_with_giant_axial_ratio_and_polarization_in_epitaxial_BiFe0_6Ga0_4O3_thin_films_ L2 - https://dx.doi.org/10.1021/am509016w DB - PRIME DP - Unbound Medicine ER -