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Title: Phase Relationship and Ionic Conductivity in Na–SrSiO 3 Ionic Conductor

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.13925· OSTI ID:1401398
 [1];  [2];  [3];  [1];
  1. Department of Mechanical Engineering University of South Carolina Columbia South Carolina 29201
  2. Texas Materials Institute The University of Texas at Austin Austin Texas 78713
  3. Department of Mechanical Engineering University of South Carolina Columbia South Carolina 29201, Department of Physics Jiangxi Normal University Nanchang Jiangxi 330022 China
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The Na–SrSiO 3 as a potential high‐conductivity ionic conductor for intermediate temperature solid oxide electrochemical cells (SOECs) has drawn much attention recently. Some of these studies questioned the feasibility of Na doping and therefore the creation of oxygen vacancies, while others suggested an alternative phase responsible for the ionic conduction. In this study, a systematic investigation was carried out to understand the ionic conduction in Na–SrSiO 3 . Through in situ high‐temperature X‐ray diffraction, thermal analysis, microstructural characterization, and electrical conductivity measurement, Na–SrSiO 3 was shown as a two‐phase material, one being slightly Na‐doped SrSiO 3 and another being amorphous Na 2 Si 2 O 5 . The former was an electrical insulator whereas the latter was a good ionic conductor. It was also found that the amorphous Na 2 Si 2 O 5 phase was unstable at the temperature ≥500°C, crystallizing into the insulating polycrystalline Na 2 Si 2 O 5 which causes conductivity to “bend‐over” at higher temperatures. A preliminary Ab Initio Molecular Dynamics ( AIMD ) simulation suggested that the amorphous Na 2 Si 2 O 5 be predominantly a Na + conductor.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐AR0000492
OSTI ID:
1401398
Journal Information:
Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Vol. 99 Journal Issue: 1; ISSN 0002-7820
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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