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Lanthanum manganite is a type p intrinsic semiconductor ceramic oxide with perovskite structure. The partial substitution in A-site of that material increases its electrical conductivity, becoming appropriate to be used in production of solid oxide fuel cells (SOFC) component for working at temperatures around at 1000 °C. In general, the properties of materials change with composition and synthesis method. In the present work, the synthesis of La1-xSrxMnO3 (x = 0,20-0,22) has been carried out by citrate method, aiming at to investigate the percentage effect of the dopante in the formation of the perovskite phase. This method allows to obtain homogenous powders and crystalline phase in lower temperatures than traditional methods of synthesis. The sample was characterized by X-ray diffraction (XRD), thermal gravimetric analyses (TGA), scanning electron microscopy (SEM) and analysis by specific surface area by BET method. The powders synthesized with 22% partial substitution of strontium showed better results relative to obtain perovskite phase.

Síntese de manganita de lantânio com substituição parcial do La por Sr pelo método citrato