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Effects of La Substitution for BiFeO<sub>3</sub> Epitaxial Thin Films
K. Wakazono,Y. Kawahara,K. Ujimoto,T. Yoshimura,N. Fujimura 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
The relationship between the Curie temperature and the piezoelectric properties for BiFeO<sub>3</sub> epitaxial thin films was investigated by using A-site substitution of La. BiFeO<sub>3</sub> and (Bi<sub>0.9</sub>La<sub>0.1</sub>)FeO<sub>3</sub> epitaxial thin films were deposited by using pulsed laser deposition. The crystallinities, ferroelectric domain structures and piezoelectric properties for the films were investigated. Although the crystallinity was improved by La substitution, the piezoelectric properties decreased. We suggest that La substitution for BiFeO<sub>3</sub> epitaxial thin films enlarges the domain size and decreases the 71˚ domain wall, which reduce the intrinsic contribution to the piezoelectric properties.