Giant thermally-enhanced electrostriction and polar surface phase in La2Mo2O9 oxygen ion conductors

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

doi:10.1103/PhysRevMaterials.2.041403

Title: Giant thermally-enhanced electrostriction and polar surface phase in $L a_{2} M o_{2} O_{9}$ oxygen ion conductors

Journal Article · Fri Apr 27 00:00:00 EDT 2018 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.2.041403· OSTI ID:1465143

Li, Qian ^[1]; Lu, Teng ^[2]; Schiemer, Jason ^[3]; Laanait, Nouamane ^[4]; Balke, Nina ^[4]; Zhang, Zhan ^[5]; Ren, Yang ^[5]; Carpenter, Michael A. ^[3]; Wen, Haidan ^[5]; Li, Jiangyu ^[6]; Kalinin, Sergei V. ^[4]; Liu, Yun ^[2]

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

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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725

OSTI ID:: 1465143

Alternate ID(s):: OSTI ID: 1434987

Journal Information:: Physical Review Materials, Vol. 2, Issue 4; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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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