The effect of MgO addition on thermomechanical and electrical transport properties of La0.5Sr0.5FeO3–δ perovskite-like ferrite

• Published in: Journal of the European Ceramic Society Vol. 45; no. 2; p. 116939
• Main Authors: Politov, B.V., Bamburov, A.D., Markov, A.A., Merkulov, O.V.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-02-2025
• Subjects: Composite oxide materials; Electrical transport parameters at elevated temperatures; Hydrogen production rate in water splitting process coupled to partial oxidation of methane; Perovskite-like ferrites; Thermomechanical properties; Perovskite-like ferrites; Thermomechanical properties; Electrical transport parameters at elevated temperatures; Hydrogen production rate in water splitting process coupled to partial oxidation of methane; Composite oxide materials
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2024.116939

Composite materials La0.5Sr0.5FeO3–δ/MgO (LSF/MgO) were synthesized by glycine-nitrate route. Phase composition was checked using X-Ray diffraction (XRD) method. Composite microstructure was confirmed by microscopic methods. MgO addition was found to facilitate sintering of the composites. Thermal expansion studies have shown that LSF/MgO materials tend to possess lower thermal expansion coefficient (TEC) with increasing of MgO addition. Measuring electrical conductivity of the composites has shown the increase of MgO content leads to non-monotonous decrease of samples’ conductance. An effective medium theory (EMT) is utilized to explain the observed feature. The obtained model parameters are used to evaluate hydrogen production rate from 1 cm2 of ceramic membrane’s surface in water splitting coupled to partial oxidation of methane (WS-POM) process. It is suggested that the addition of MgO in the amount of 3–6 mass % to LSF can be a perspective tool for improving WS-POM efficiency.