Giant thermally-enhanced electrostriction and polar surface phase in oxygen ion conductors
Abstract
Ferroelectrics possess spontaneous electric polarization at macroscopic scales which nonetheless imposes strict limitations on the material classes. Recent discoveries of untraditional symmetry-breaking phenomena in reduced material dimensions have indicated feasibilities to extend polar properties to broader types of materials, potentially opening up the freedom for designing materials with hybrid functionalities. Here in this paper, we report the unusual electromechanical properties of La2Mo2O9 (LAMOX) oxygen ion conductors, systematically investigated at both bulk and surface length levels. We first observed giant electrostriction effects in La2Mo2O9 bulk ceramics that are thermally enhanced in concert with their low-energy oxygen-vacancy hopping dynamics. Moreover, while no clear bulk polarization was detected, the surface phases of LAMOX were found to be manifestly polar, likely originating from the coupling between the intrinsic structural flexibilities with strain gradients (i.e., flexoelectricity) and/or chemical heterogeneities present in the materials. These findings identify La2Mo2O9 as a promising electromechanical material system and suggest that the flexible structural and chemical configurations in ionically active materials could enable fundamentally different venues to accommodate electric polarization.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS); Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
- Australian National Univ., Canberra, ACT (Australia). Research School of Chemistry
- Univ. of Cambridge (United Kingdom). Dept. of Earth Sciences
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
- Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
- Univ. of Washington, Seattle, WA (United States). Dept. of Mechanical Engineering
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1465143
- Alternate Identifier(s):
- OSTI ID: 1434987
- Grant/Contract Number:
- AC02-06CH11357; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 2; Journal Issue: 4; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Li, Qian, Lu, Teng, Schiemer, Jason, Laanait, Nouamane, Balke, Nina, Zhang, Zhan, Ren, Yang, Carpenter, Michael A., Wen, Haidan, Li, Jiangyu, Kalinin, Sergei V., and Liu, Yun. Giant thermally-enhanced electrostriction and polar surface phase in La2Mo2O9 oxygen ion conductors. United States: N. p., 2018.
Web. doi:10.1103/PhysRevMaterials.2.041403.
Li, Qian, Lu, Teng, Schiemer, Jason, Laanait, Nouamane, Balke, Nina, Zhang, Zhan, Ren, Yang, Carpenter, Michael A., Wen, Haidan, Li, Jiangyu, Kalinin, Sergei V., & Liu, Yun. Giant thermally-enhanced electrostriction and polar surface phase in La2Mo2O9 oxygen ion conductors. United States. https://doi.org/10.1103/PhysRevMaterials.2.041403
Li, Qian, Lu, Teng, Schiemer, Jason, Laanait, Nouamane, Balke, Nina, Zhang, Zhan, Ren, Yang, Carpenter, Michael A., Wen, Haidan, Li, Jiangyu, Kalinin, Sergei V., and Liu, Yun. Fri .
"Giant thermally-enhanced electrostriction and polar surface phase in La2Mo2O9 oxygen ion conductors". United States. https://doi.org/10.1103/PhysRevMaterials.2.041403. https://www.osti.gov/servlets/purl/1465143.
@article{osti_1465143,
title = {Giant thermally-enhanced electrostriction and polar surface phase in La2Mo2O9 oxygen ion conductors},
author = {Li, Qian and Lu, Teng and Schiemer, Jason and Laanait, Nouamane and Balke, Nina and Zhang, Zhan and Ren, Yang and Carpenter, Michael A. and Wen, Haidan and Li, Jiangyu and Kalinin, Sergei V. and Liu, Yun},
abstractNote = {Ferroelectrics possess spontaneous electric polarization at macroscopic scales which nonetheless imposes strict limitations on the material classes. Recent discoveries of untraditional symmetry-breaking phenomena in reduced material dimensions have indicated feasibilities to extend polar properties to broader types of materials, potentially opening up the freedom for designing materials with hybrid functionalities. Here in this paper, we report the unusual electromechanical properties of La2Mo2O9 (LAMOX) oxygen ion conductors, systematically investigated at both bulk and surface length levels. We first observed giant electrostriction effects in La2Mo2O9 bulk ceramics that are thermally enhanced in concert with their low-energy oxygen-vacancy hopping dynamics. Moreover, while no clear bulk polarization was detected, the surface phases of LAMOX were found to be manifestly polar, likely originating from the coupling between the intrinsic structural flexibilities with strain gradients (i.e., flexoelectricity) and/or chemical heterogeneities present in the materials. These findings identify La2Mo2O9 as a promising electromechanical material system and suggest that the flexible structural and chemical configurations in ionically active materials could enable fundamentally different venues to accommodate electric polarization.},
doi = {10.1103/PhysRevMaterials.2.041403},
journal = {Physical Review Materials},
number = 4,
volume = 2,
place = {United States},
year = {Fri Apr 27 00:00:00 EDT 2018},
month = {Fri Apr 27 00:00:00 EDT 2018}
}
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