Effect of strontium ion doping on structural, thermal, morphological and electrical properties of a co-doped lanthanum manganite system

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Abstract

An effect of strontium ion doping on the structural, thermal, morphological and electrical properties of a co-doped lanthanum manganite system, La1-xSrx Mn0.85Fe0.05Co0.05Ni0.05O3+δ (x = 0-0.4 mole) is investigated for the solid oxide fuel cell cathode application. The submicron and rhombohedral structured sample, synthesized by the Pechini method, exhibited a decrease in the unit cell volume with increasing x. The thermogravimetry study portrayed nearly fivefold weight loss for a sample with x = 0.3 mole relative to the La0.75Sr0.25MnO3+δ and suggested an improvement in the concentration of the oxygen vacancy for ion migration due to the co-doping effect. It also showed sufficiently high electrical conductivity (∼76 S cm-1) at 650 °C along with a low activation energy (∼0.15 eV), a comparable coefficient of thermal expansion (∼12.1 × 10-6 °C-1) and a chemical compatibility with the solid electrolytes. The results were explained using the defect models. © 2009 Elsevier B.V. All rights reserved.

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Gupta, R. K., Kim, E. Y., Kim, Y. H., & Whang, C. M. (2010). Effect of strontium ion doping on structural, thermal, morphological and electrical properties of a co-doped lanthanum manganite system. Journal of Alloys and Compounds, 490(1–2), 56–61. https://doi.org/10.1016/j.jallcom.2009.10.095

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