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Sandoval, Mónica V.; Durán, Silvia; Prada, Andrea; Pirovano, Caroline; Gardoll, Olivier; Roussel, Pascal; Gauthier, Gilles H.
Solid state ionics, April 2018, 2018-04-00, 2018-04, Letnik: 317Journal Article
NdxAE2-xMnO4±δ (AE: Ca, Sr) manganites with x = 0.25, 0.4, 0.5 and 0.60 are part of the Ruddlesden-Popper family of generic formula An+1BnO3n+1 with n = 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 - 850 °C/16 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 12.7 × 10−6 K−1 and 14.4 × 10−6 K−1 in air and 3% H2/N2 (25–800 °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 33.4 S cm−1 and 0.9 S cm−1 at 800 °C, meeting the preliminary requirements for use as symmetrical SOFC electrode. •Ruddlesden Popper NdxSr2-xMnO4±δ are stable as S-SOFC electrode for 0.4 ≤ x ≤ 0.6.•RP NdxCa2-xMnO4±δ decompose in reducing atmosphere characteristic of SOFC anode.•Nd0.5Sr1.5MnO4±δ (NSM) is thermomechanically and chemically compatible with GDC.•NSM conductivity values in air and 3% H2/Ar are 33.4 and 0.9 S cm−1 at 800 °C.
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