article
Síntese de Manganita de Lantânio com substituição parcial do La por Sr pelo método citrato
Fecha
2007Registro en:
1517-7076
10.1590/S1517-70762007000100009
Autor
Silva, Walquíria Joseane da
Melo, Dulce Maria de Araújo
Soares, Sibelle Feitosa da Cunha X.
Pimentel, Patrícia Mendonça
Nascimento, Rubens Maribondo do
Martinelli, Antonio Eduardo
Rabelo, Adriano Alves
Resumen
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