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Hexagonal perovskite, Ba7Nb4MoO20, Ba7Nb4-xMo1+xO20+(1/2)x (x = 0.1), Ba7Nb4-yWyMoO20+(1/2)y (y = 0.15), and Ba7Ta4-zMo1+zO20+(1/2)z (z = 0.3) have recently been reported to exhibit high oxide-ion and proton conductivity. These materials are of great interest in industrial applications such as solid oxide fuel cells (SOFCs) and proton ceramic fuel cells (PCFCs) and are known for their unusual structures. Although the structures of Ba7Nb4MoO20 and their related materials were primarily analyzed by assuming an even distribution of Mo and Nb at each M(= Mo/Nb) site, solid-state nuclear magnetic resonance (NMR) spectra have revealed that Mo and Nb are unevenly distributed in Ba7Nb4MoO20. As it is crucial to determine whether the contributions to oxide-ion and proton conduction are the same for Mo and Nb, we focused on the signal differences among these as-prepared materials.

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• Creative Commons BY Attribution 4.0 International
  

  This publication is licensed under CC-BY 4.0 .

Keyword: Fuel Cell, Oxide-ion Conductor, Proton Conductor, High Conductivity, Solid Solution, Nonstoichiometric Compound, Structural Analysis

Date published: 2024-11-21

Publisher: American Chemical Society (ACS)

Journal:

• The Journal of Physical Chemistry C (ISSN: 19327447)

Funding:

• Japan Society for the Promotion of Science JP19H00821
• Japan Society for the Promotion of Science JP21K18182

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/acs.jpcc.4c02645

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Updated at: 2024-11-14 16:30:26 +0900

Published on MDR: 2024-11-14 16:30:26 +0900