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Meléndez, Hildemaro
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document
Síntesis de Perovskitas A`1-yA``yB`1-xB``xO3 (A= La, Ca, Sr y B=Ni, Co) preparadas por el método de combustión en solución, vía radiación microondas Synthesis of Perovskites A`1-yA``yB`1-xB``xO3 (A= La, Ca, Sr and B= Ni, Co) prepared by the combustion method in solution, via microwave radiation
Abstract
Se sintetizaron una serie de oxidos mixtos tipo perovskita A`1-yA``yB`1-xB``xO3variando los elementos estructurales de la misma, tanto el elemento alcalinoterreo/lantanido (A= La, Ca, Sr) como el metalico(B= Ni, Co);esta sintesis se llevo a cabo a traves del metodo de combustion en solucion (SCS) empleando radiacionmicroonda como mecanismo de ignicion y, en presencia de glicina (F=0,9). Los solidos fueron caracterizados fisicoquimicamentea traves dela difraccion de rayos-X (DRX), la espectroscopia infrarroja con transformada de Fourier (FTIR) y midiendo el area superficial por el metodo del punto unico. Los resultados muestran que el tamano promedio de los dominios cristalinos en todas las perovskitasesta por debajo de los 20nm, ademas, que con la DRXse verifica la formacion de la fase predominante de la perovskita deseada, simultaneamente con una segunda fase del tipo A2BO4. Palabras claves: Perovskita, nanoparticula, oxidos mixtos, combustion. A series of perovskite-type mixed oxides A`1-yA``yB`1-xB``xO3 were synthesized, varying the structural elements of the same, both the alkaline earth/lanthanide element (A= La, Ca, Sr) and the metallic (B= Ni, Co); this synthesis was carried out through the solution combustion method (SCS) using microwave radiation as an ignition mechanism and, in the presence of glycine (F = 0.9). The solids were characterized physiochemically through X-ray diffraction (XRD), infrared spectroscopy with Fourier transform (FTIR) and measuring the surface area by the single point method. The results show that the average size of the crystalline domains in all perovskites is below 20 nm, in addition, that with the XRD the formation of the predominant phase of the desired perovskite is verified, simultaneously with a second phase of the A2BO4 type.