Synthesis and characterization of La1-xSr xMnO3±δ powders obtained by the polymeric precursor route

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 14; no. 1; pp. 91 - 96
• Main Authors: Rabelo, Adriano Alves, Macedo, Marfran Cardoso de, Melo, Dulce Maria de Araújo, Paskocimas, Carlos Alberto, Martinelli, Antonio Eduardo, Nascimento, Rubens Maribondo do
• Format: Journal Article
• Language: English; Portuguese
• Published: ABM, ABC, ABPol 01.03.2011; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: ENGINEERING, CHEMICAL; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; perovskite; polymeric precursor; SOFC; polymeric precursor; perovskite; SOFC
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/S1516-14392011005000018

Polycrystalline strontium-doped lanthanum manganite (LSM) powders with 0.15, 0.22, and 0.30 mol % Sr were synthesized by the polymeric precursor route using a molar ratio of 3:1 citric acid and metal cations. The powders were characterized by Fourier transform infrared spectroscopy, thermal analysis, high-temperature X-ray diffraction to determine the crystalline perovskite phase and crystallite sizes, scanning electron microscopy for the morphological analysis, nitrogen adsorption to determine the specific surface area, and laser scattering to evaluate the particle size distribution. The LSM perovskite-type oxides containing intermediate 0.22 mol % Sr were found to exhibit a tendency to decrease in crystallite size and increase in specific surface area and, when calcined at 700-900 ºC exhibited a pure phase of perovskite, had a crystallite size of about 17-20 nm and a specific surface area for 900 ºC of 34.3 m².g-1.