%0 Journal Article
%T Estudio comparativo del uso de ¨¢cido c¨ªtrico y urea en la s¨ªntesis de manganitas de calcio dopadas con europio, por el m¨¦todo de combusti¨®n Comparative study of the use of citric acid and urea in the synthesis of calcium manganites doped with eu, by combustion method
%A Felipe Legorreta-Garc¨ªa
%A Leticia E Hern¨¢ndez-Cruz
%A Francisco J Garc¨ªa-Delgado
%A Ana Mar¨ªa Bolar¨ªn-Mir¨®
%J Revista Latinoamericana de Metalurgia y Materiales
%D 2012
%I Universidad Sim¨®n Bol¨ªvar
%X Se sintetizaron mediante el m¨¦todo de combusti¨®n, manganitas de calcio dopadas con europio de composici¨®n estequiom¨¦trica ideal Eu0.05Ca0.95MnO3-¦Ä; utilizando como sales precursoras, nitratos de calcio, manganeso y europio. Se estudi¨® el efecto del tipo de agente combustible (¨¢cido c¨ªtrico y urea) y su concentraci¨®n (urea (U): 1, 2, 3, 4, 5, 10 y 20) y ¨¢cido c¨ªtrico (AC): 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 5, 7 y 10). Con la finalidad de estudiar el tama o, la morfolog¨ªa y la estructura cristalina de las part¨ªculas se hicieron an¨¢lisis de tama o de part¨ªcula (ATP), microscop¨ªa electr¨®nica de barrido (MEB) y difracci¨®n de rayos X (DRX). Se sintetiz¨® exitosamente la manganita mediante el m¨¦todo de combusti¨®n, estructuralmente constituida por una mezcla de dos fases: CaMnO3-ortorr¨®mbica y Ca2MnO4-tetra¨¦drica. Los resultados revelaron que la proporci¨®n de agente combustible afecta notablemente el rendimiento, la morfolog¨ªa y tama o de las part¨ªculas sintetizadas. Calcium manganites doped with europium were synthesized by combustion method, in a stoichiometric composition Eu0.05Ca0.95MnO3-¦Ä; using as precursors salts, nitrates of calcium, manganese and europium. The type of fuel agent effect (citric acid and urea), the concentration effect (urea (U: 1, 2, 3, 4, 5, 10 y 20) and citric acid effect (AC: 0.25, 0.5, 0.75, 1, 1.5, 2, 3, 4, 5, 7 y 10)) of fuel agent were studied. In order to study the size, the morphology and the crystal structure of the particles, there were made particle size analyses (PSA), scanning electron microscopy (SEM) and X-ray diffraction (XRD). Manganite was successfully synthesized by combustion method, structurally composed of a mixture of two phases: CaMnO3-orthorhombic and Ca2MnO4-tetrahedral. The results showed that the proportion of fuel agent effects the performance, the morphology and size of the synthesized particles.
%K Manganitas
%K Europio
%K Combusti¨®n
%K S¨ªntesis
%K Manganites
%K Europium
%K Combustion
%K Synthesis
%U http://wwww.scielo.org.ve/scielo.php?script=sci_arttext&pid=S0255-69522012000100003