Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7744509 | Solid State Ionics | 2018 | 7 Pages |
Abstract
NdxAE2-xMnO4±δ (AE: Ca, Sr) manganites with xâ¯=â¯0.25, 0.4, 0.5 and 0.60 are part of the Ruddlesden-Popper family of generic formula An+1BnO3n+1 with nâ¯=â¯1. The compositions range that can be successfully synthesized by the sol-gel method in air has been identified. While Sr compounds are stable in reducing atmosphere (3% H2/Ar - 850â¯Â°C/16â¯h), Ca ones decompose when submitted to such atmosphere. Nd0.5Sr1.5MnO4±δ was analyzed by High-Temperature X-ray diffraction (HT-XRD) showing TEC values of 12.7â¯Ãâ¯10â6â¯Kâ1 and 14.4â¯Ãâ¯10â6â¯Kâ1 in air and 3% H2/N2 (25-800â¯Â°C), respectively. Using standard conditions for electrode elaboration, the material reacts with YSZ electrolyte, but is chemically compatible with GDC electrolyte. A small polaron-type behavior is observed for the electrical conductivity of Nd0.5Sr1.5MnO4±δ in air and 3% H2/Ar, with respective values of 33.4â¯Sâ¯cmâ1 and 0.9â¯Sâ¯cmâ1 at 800â¯Â°C, meeting the preliminary requirements for use as symmetrical SOFC electrode.
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Physical Sciences and Engineering
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Authors
Mónica V. Sandoval, Silvia Durán, Andrea Prada, Caroline Pirovano, Olivier Gardoll, Pascal Roussel, Gilles H. Gauthier,