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Matsushima, Masaaki
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article
Unusual 90°domain structure in (2/3)Bi(Zn1/2Ti 1/2)O3-(1/3)BiFeO3 epitaxial films with giant 22% tetragonal distortion
Abstract
Epitaxial films of tetragonal (001)/(100)-oriented (2/3)Bi(Zn <sub>1/2</sub>Ti<sub>1/2</sub>)O<sub>3</sub>-(1/3)BiFeO<sub>3</sub> were grown on (100)cSrRuO<sub>3</sub>//(100)SrTiO<sub>3</sub> substrates by metalorganic chemical vapor deposition. 93% of the film is occupied by c-domain [(001) orientation], and the out-of-plane (c-axis) and in-plane (a-axis) lattice parameters are 0.465 nm and 0.381 nm, respectively. The tetragonal distortion, (c/a)-1, is 22% which is 3.5 times larger than that of PbTiO<sub>3</sub> (6.3%). High-angle annular dark-field-scanning transmission electron microscopy images show clear c-/a-domain structures with unusual boundary angles of 51°/39°due to the large c/a ratio of tetragonal phase. High temperature X-ray diffraction measurements reveal that the Curie temperature of this film is above 800°C. © 2013 AIP Publishing LLC.