Designing Morphotropic Phase Composition in BiFeO3

Andreas Herklotz; Stefania F. Rus; Nina Balke; Christopher Rouleau; Er Jia Guo; Amanda Huon; Santosh Kc; Robert Roth; Xu Yang; Chirag Vaswani; Jigang Wang; Peter P. Orth; Mathias S. Scheurer; Thomas Z. Ward

doi:10.1021/acs.nanolett.8b04322

Designing Morphotropic Phase Composition in BiFeO₃

Andreas Herklotz, Stefania F. Rus, Nina Balke, Christopher Rouleau, Er Jia Guo, Amanda Huon, Santosh Kc, Robert Roth, Xu Yang, Chirag Vaswani, Jigang Wang, Peter P. Orth, Mathias S. Scheurer, Thomas Z. Ward

Functional Hybrid Nanomaterials

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

25 Scopus citations

Abstract

In classical morphotropic piezoelectric materials, rhombohedral and tetragonal phase variants can energetically compete to form a mixed phase regime with improved functional properties. While the discovery of morphotropic-like phases in multiferroic BiFeO₃ films has broadened this definition, accessing these phase spaces is still typically accomplished through isovalent substitution or heteroepitaxial strain which do not allow for continuous modification of phase composition postsynthesis. Here, we show that it is possible to use low-energy helium implantation to tailor morphotropic phases of epitaxial BiFeO₃ films postsynthesis in a continuous and iterative manner. Applying this strain doping approach to morphotropic films creates a new phase space based on internal and external lattice stress that can be seen as an analogue to temperature-composition phase diagrams of classical morphotropic ferroelectric systems.

Original language	English
Pages (from-to)	1033-1038
Number of pages	6
Journal	Nano Letters
Volume	19
Issue number	2
DOIs	https://doi.org/10.1021/acs.nanolett.8b04322
State	Published - Feb 13 2019

Funding

This work was supported by the U.S. Department of Energy (DOE), Office of Science, Early Career Research Program, and Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. SHG work at the Iowa State University was supported by the Ames Laboratory, the U.S. DOE, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division under contract DE-AC02-07CH11358. SHG modeling work by M.S.S. was from the support of the German National Academy of Sciences Leopoldina through Grant LPDS 2016-12. M.S.S. thanks Alberto de la Torre Duran for very useful SHG discussion. This research used resources of the Center for Nanophase Materials Sciences (Raman Spectroscopy), which is a DOE Office of Science User Facility.

Funders	Funder number
Materials Science and Engineering Division
U.S. DOE
U.S. Department of Energy	DE-AC02-07CH11358
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Ames Laboratory
Division of Materials Sciences and Engineering
Deutsche Akademie der Naturforscher Leopoldina - Nationale Akademie der Wissenschaften	LPDS 2016-12
Deutsche Akademie der Naturforscher Leopoldina - Nationale Akademie der Wissenschaften

Keywords

Morphotropic phases
ferroelectrics
implantation
metastability
strain

Access to Document

10.1021/acs.nanolett.8b04322

Cite this

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AU - Rus, Stefania F.

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AU - Rouleau, Christopher

AU - Guo, Er Jia

AU - Huon, Amanda

AU - Kc, Santosh

AU - Roth, Robert

AU - Yang, Xu

AU - Vaswani, Chirag

AU - Wang, Jigang

AU - Orth, Peter P.

AU - Scheurer, Mathias S.

AU - Ward, Thomas Z.

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AB - In classical morphotropic piezoelectric materials, rhombohedral and tetragonal phase variants can energetically compete to form a mixed phase regime with improved functional properties. While the discovery of morphotropic-like phases in multiferroic BiFeO3 films has broadened this definition, accessing these phase spaces is still typically accomplished through isovalent substitution or heteroepitaxial strain which do not allow for continuous modification of phase composition postsynthesis. Here, we show that it is possible to use low-energy helium implantation to tailor morphotropic phases of epitaxial BiFeO3 films postsynthesis in a continuous and iterative manner. Applying this strain doping approach to morphotropic films creates a new phase space based on internal and external lattice stress that can be seen as an analogue to temperature-composition phase diagrams of classical morphotropic ferroelectric systems.

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