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Title: Giant thermally-enhanced electrostriction and polar surface phase in L a 2 M o 2 O 9 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 La 2Mo 2O 9 (LAMOX) oxygen ion conductors, systematically investigated at both bulk and surface length levels. We first observed giant electrostriction effects in La 2Mo 2O 9 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 La 2Mo 2O 9 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:
 [1];  [2];  [3];  [4];  [4];  [5];  [5];  [3];  [5];  [6];  [4];  [2]
  1. 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
  2. Australian National Univ., Canberra, ACT (Australia). Research School of Chemistry
  3. Univ. of Cambridge (United Kingdom). Dept. of Earth Sciences
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  5. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  6. Univ. of Washington, Seattle, WA (United States). Dept. of Mechanical Engineering
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1465143
Alternate Identifier(s):
OSTI ID: 1434987
Grant/Contract Number:  
AC02-06CH11357; AC05-00OR22725
Resource Type:
Journal Article: 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. 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., and Liu, Yun. Fri . "Giant thermally-enhanced electrostriction and polar surface phase in La2Mo2O9 oxygen ion conductors". United States. doi:10.1103/PhysRevMaterials.2.041403.
@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}
}

Journal Article:
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Works referenced in this record:

Local polarization dynamics in ferroelectric materials
journal, April 2010

  • Kalinin, Sergei V.; Morozovska, Anna N.; Chen, Long Qing
  • Reports on Progress in Physics, Vol. 73, Issue 5, Article No. 056502
  • DOI: 10.1088/0034-4885/73/5/056502