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

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

doi:10.1063/1.4864077

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

BiFeO₃ films with in-plane compressive strain of -3.5% were deposited on oxygen-deficient La_0.3Sr_0.7MnO _3-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 M_C-type monoclinic structure, and finally alleviated through the M_C-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%.

Original language	English
Article number	052908
Journal	Applied Physics Letters
Volume	104
Issue number	5
DOIs	https://doi.org/10.1063/1.4864077
Publication status	Published - 3 Feb 2014
Externally published	Yes

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title = "Tetragonal-tetragonal-monoclinic-rhombohedral transition: Strain relaxation of heavily compressed BiFeO3 epitaxial thin films",

abstract = "BiFeO3 films with in-plane compressive strain of -3.5% were deposited on oxygen-deficient La0.3Sr0.7MnO 3-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%.",

author = "Z. Fu and Yin, {Z. G.} and Chen, {N. F.} and Zhang, {X. W.} and Zhao, {Y. J.} and Bai, {Y. M.} and Y. Chen and Wang, {H. H.} and Zhang, {X. L.} and Wu, {J. L.}",

year = "2014",

month = feb,

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doi = "10.1063/1.4864077",

language = "English",

volume = "104",

journal = "Applied Physics Letters",

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T1 - Tetragonal-tetragonal-monoclinic-rhombohedral transition

T2 - Strain relaxation of heavily compressed BiFeO3 epitaxial thin films

AU - Fu, Z.

AU - Yin, Z. G.

AU - Chen, N. F.

AU - Zhang, X. W.

AU - Zhao, Y. J.

AU - Bai, Y. M.

AU - Chen, Y.

AU - Wang, H. H.

AU - Zhang, X. L.

AU - Wu, J. L.

PY - 2014/2/3

Y1 - 2014/2/3

N2 - BiFeO3 films with in-plane compressive strain of -3.5% were deposited on oxygen-deficient La0.3Sr0.7MnO 3-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%.

AB - BiFeO3 films with in-plane compressive strain of -3.5% were deposited on oxygen-deficient La0.3Sr0.7MnO 3-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%.

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

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