Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

Sebastian Wachowski; Aleksandra Mielewczyk-Gryń; Krzysztof Zagórski; Cheng Li; Piotr Jasiński; Stephen J. Skinner; Reidar Haugsrud; Maria Gazda

doi:10.1039/C6TA03403A

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Influence of Sb-substitution on ionic transport in lanthanum orthoniobates†

Sebastian Wachowski,

*^ab Aleksandra Mielewczyk-Gryń,

^a Krzysztof Zagórski,^a Cheng Li,^c Piotr Jasiński,

^d Stephen J. Skinner,

^c Reidar Haugsrud^b and Maria Gazda^a

Author affiliations

* Corresponding authors

^a Department of Solid State Physics, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland
E-mail: swachowski@mif.pg.gda.pl
Tel: +48 58 348 66 12

^b University of Oslo, Department of Chemistry, Centre for Materials Science and Nanotechnology (SMN), FERMiO, Gaustadalléen 21, Norway

^c Department of Materials, Imperial College London, Exhibition Road, London, UK

^d Department of Biomedical Engineering, Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, Narutowicza 11/12, Poland

Abstract

The results of ionic transport measurements for the lanthanum orthoniobate substituted with 10 and 30 mol% of antimony (LaNb_0.9Sb_0.1O₄ and LaNb_0.7Sb_0.3O₄) are presented and discussed. The influence of calcium co-doping on these properties has also been analysed. It has been shown that for the investigated material protonic conductivity predominates at temperatures up to 800 °C in oxidizing atmospheres under wet conditions. The maximum observed protonic conductivity reaches ∼10⁻⁴ S cm⁻¹ at 800 °C (in humidified air); under dry conditions, the increasing influence of oxygen vacancies and holes is detected. Oxygen self-diffusivity has also been analysed by isotopic exchange to investigate the possible diffusion paths.

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DOI: https://doi.org/10.1039/C6TA03403A
Article type: Paper
Submitted: 23 Apr 2016
Accepted: 22 Jun 2016
First published: 23 Jun 2016

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J. Mater. Chem. A, 2016,4, 11696-11707

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Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

S. Wachowski, A. Mielewczyk-Gryń, K. Zagórski, C. Li, P. Jasiński, S. J. Skinner, R. Haugsrud and M. Gazda, J. Mater. Chem. A, 2016, 4, 11696 DOI: 10.1039/C6TA03403A

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Journal of Materials Chemistry A

Influence of Sb-substitution on ionic transport in lanthanum orthoniobates†

Abstract

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Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

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