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Antimony substituted lanthanum orthoniobate proton conductor - Structure and electronic properties

Mielewczyk-Gryn, A; Wachowski, S; Witkowska, A; Dzierzgowski, K; Skubida, W; Swierczek, K; Regoutz, A; ... Gazda, M; + view all (2020) Antimony substituted lanthanum orthoniobate proton conductor - Structure and electronic properties. Journal of the American Ceramic Society , 103 (11) pp. 6575-6585. 10.1111/jace.17352. Green open access

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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.

Type: Article
Title: Antimony substituted lanthanum orthoniobate proton conductor - Structure and electronic properties
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/jace.17352
Publisher version: https://doi.org/10.1111/jace.17352
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Materials Science, Ceramics, Materials Science, extended X-ray absorption fine structure, fuel cell materials, neutron diffraction, phase transition, superionic conductor, PHASE-TRANSITION, STABILITY
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10111873
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