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Title: Large bi-axial tensile strain effect in epitaxial BiFeO3 film grown on single crystal PrScO3
Abstract A BiFeO3film is grown epitaxially on a PrScO3single crystal substrate which imparts ~ 1.45% of biaxial tensile strain to BiFeO3resulting from lattice misfit. The biaxial tensile strain effect on BiFeO3is investigated in terms of crystal structure, Poisson ratio, and ferroelectric domain structure. Lattice resolution scanning transmission electron microscopy, precession electron diffraction, and X-ray diffraction results clearly show that in-plane interplanar distance of BiFeO3is the same as that of PrScO3with no sign of misfit dislocations, indicating that the biaxial tensile strain caused by lattice mismatch between BiFeO3and PrScO3are stored as elastic energy within BiFeO3film. Nano-beam electron diffraction patterns compared with structure factor calculation found that the BiFeO3maintains rhombohedral symmetry, i.e., space group ofR3c. The pattern analysis also revealed two crystallographically distinguishable domains. Their relations with ferroelectric domain structures in terms of size and spontaneous polarization orientations within the domains are further understood using four-dimensional scanning transmission electron microscopy technique.  more » « less
Award ID(s):
2039380
PAR ID:
10489003
Author(s) / Creator(s):
; ; ; ;
Publisher / Repository:
SpringerNature
Date Published:
Journal Name:
Scientific Reports
Volume:
13
Issue:
1
ISSN:
2045-2322
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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