Issue 30, 2016

Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

Abstract

The results of ionic transport measurements for the lanthanum orthoniobate substituted with 10 and 30 mol% of antimony (LaNb0.9Sb0.1O4 and LaNb0.7Sb0.3O4) 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.

Graphical abstract: Influence of Sb-substitution on ionic transport in lanthanum orthoniobates

Supplementary files

Article information

Article type
Paper
Submitted
23 Apr 2016
Accepted
22 Jun 2016
First published
23 Jun 2016

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

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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