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Structural, thermal and electrical conductivity characteristics of Ln0.5Sr0.5Ti0.5Mn0.5O3±d (Ln: La, Nd and Sm) complex perovskites as anode materials for solid oxide fuel cell

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Author(s)

J. Jeong, A.K. Azad, H. Schlegl, B. Kim, S.-W. Baek, K. Kim, H. Kang, J.H. Kim

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Abstract

The Ti and Mn replaced complex perovskites, Ln0.5Sr0.5Ti0.5Mn0.5O3±d (Ln: La, Nd and Sm), were reported as potential anode materials for high temperature-operating solid oxide fuel cells (HT-SOFCs). For the present research study, synthesis, crystallographic, thermal and electrical conductivity properties of Ln0.5Sr0.5Ti0.5Mn0.5O3±d complex perovskites were investigated using X-ray diffraction (XRD), Rietveld method, thermogravimetric analysis (TGA) and electrical conductivity to apply these oxide materials for the HT-SOFC anode materials.

XRD results showed that Ln0.5Sr0.5Ti0.5Mn0.5O3±d oxide systems synthesized as single phases did not react with 8 mol% yttria stabilized zirconia (8YSZ) and 10 mol% Gd-doped cerium oxide (CGO91) up to 1500 °C and did not decompose under dry 3.9% hydrogen at 850 °C. The crystal structures of La0.5Sr0.5Ti0.5Mn0.5O3±d (LSTM), Nd0.5Sr0.5Ti0.5Mn0.5O3±d (NSTM) and Sm0.5Sr0.5Ti0.5Mn0.5O3±d (SSTM) showed orthorhombic symmetry with the space group Pbnm and SSTM showed a more distorted structure. Thermogravimetric analysis (TGA) proved weight gains in these three sample occurred under oxidizing conditions and weight loss under reducing conditions. Electrical conductivity values of NSTM were higher than those of LSTM and SSTM under oxidizing and reducing conditions.

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Original languageEnglish
Pages (from-to)154-163
Number of pages10
JournalJournal of Solid State Chemistry
Volume226
Early online date19 Feb 2015
DOIs
Publication statusPublished - Mar 2015

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