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Start Over Author "Fu, Z." Journal applied physics letters
11 results on '"Fu, Z."'

11. Tetragonal-tetragonal-monoclinic-rhombohedral transition: Strain relaxation of heavily compressed BiFeO3 epitaxial thin films.

Author

Fu, Z., Yin, Z. G., Chen, N. F., Zhang, X. W., Zhao, Y. J., Bai, Y. M., Chen, Y., Wang, H.-H., Zhang, X. L., and Wu, J. L.

Subjects
*THIN films, *RELAXATION phenomena, *SUBSTRATES (Materials science), *SOLID state electronics, *CONDENSED matter physics
Abstract

BiFeO3 films with in-plane compressive strain of -3.5% were deposited on oxygen-deficient La0.3Sr0.7MnO3-δ buffered SrTiO3(001) substrates. This highly strained BiFeO3 does not relax directly into its rhombohedral parent phase upon increasing the film thickness. Instead, a multi-step path involving structural transitions is observed. The misfit stress is first accommodated by the occurrence of true tetragonal BiFeO3 with c/a ratio of 1.23, then reduced by the transformation to the MC-type monoclinic structure, and finally alleviated through the MC-rhombohedral transition. Moreover, this process enables the formation of strain-driven morphotropic phase boundaries at a stress level much lower than the reported threshold of -4.5%. [ABSTRACT FROM AUTHOR]

Published
2014
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