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Antimony substituted lanthanum orthoniobate proton conductor – structure and electronic properties.

Abstract

X‐ray and neutron diffraction have been utilized to analyze the crystalline and electronic structure of lanthanum orthoniobate substituted by antimony. Using X‐ray absorption spectroscopy and photoelectron spectroscopy, changes in the electronic structure of the material upon substitution have been analyzed. The structural transition temperature between fergusonite and scheelite phases for 30 mol% antimony substitution was found to be 15 °C. Based on the neutron data, the oxygen nonstoichiometry was found to be relatively low. Moreover, no influence on the position of the valence band maximum was observed. The influence of the protonation on the electronic structure of constituent oxides has been studied. Absorption data show that the incorporation of protonic defects into the lanthanum orthoniobate structure leads to changes in lanthanum electronic structure and a decrease in the density of unoccupied electronic states.

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
JOURNAL OF THE AMERICAN CERAMIC SOCIETY no. 103, pages 6575 - 6585,
ISSN: 0002-7820
Language:
English
Publication year:
2020
Bibliographic description:
Mielewczyk-Gryń A., Wachowski S., Witkowska A., Dzierzgowski K., Skubida W., Świerczek K., Regoutz A., Payne D., Hull S., Zhang H., Abrahams I., Gazda M.: Antimony substituted lanthanum orthoniobate proton conductor – structure and electronic properties.// JOURNAL OF THE AMERICAN CERAMIC SOCIETY -Vol. 103,iss. 11 (2020), s.6575-6585
DOI:
Digital Object Identifier (open in new tab) 10.1111/jace.17352
Verified by:
Gdańsk University of Technology

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