
handle: 10261/64090 , 21.15107/rcub_dais_460
[ES] Mediante el método de Spray Pirólisis (SP) operando a 700ºC y en atmósfera de aire seco, se obtuvieron partículas nanoestructuradas de composición Gd2-xEuxO3 (x= 0.05, 0.10 y 0.30) partiendo de las respectivas disoluciones acuosas de nitratos (0.1M). En el presente trabajo, se estudiaron tres muestras con distinta concentración de europio correspondiente al 1, 2 y 6% atómico. Posteriormente, las partículas nanoestructuradas obtenidas se sometieron a distintos tratamientos térmicos comprendidos entre 800 y 1000ºC/12h en atmósfera de aire. Las partículas obtenidas se caracterizaron mediante técnicas de DRX, SEM, dispersión láser y medidas de fluorescencia en estado estacionario. Se ha podido identificar la existencia de dos fases cristalinas cúbicas con distinta simetría (Ia-3 y Fm-3m) en las muestras “as-prepared”. Además, se ha demostrado la presencia de una fase de Gd2O3 monoclínica (C2/m), la cual desaparece con los tratamientos térmicos posteriores. En todas las muestras tratadas térmicamente se observa la estabilización de la fase cúbica más estable con simetría Ia-3. Mediante medidas de emisión de fluorescencia se ha podido detectar en todas las muestras estudiadas la presencia de Eu2+ (l=430nm), independientemente del porcentaje de Eu3+.
[EN] Spray Pyrolysis (SP) is performed at 700ºC in dry air atmosphere using common nitrate aqueous solutions (0,1M) as precursor in order to obtain nanostructured particles with the composition Gd2-xEuxO3 (x= 0.05, 0.10 and 0.30). In this work, three samples with different atomic europium concentration (1, 2 and 6%) were studied. After, the obtained particles were subjected to different thermal treatments with varying temperatures between 800 and 1000ºC/12 h in dry air atmosphere. The obtained particles were characterized by XRD, SEM techniques, laser dispersion and steady state fluorescence spectroscopy. The existence of two cubic phases with different symmetry cubic phases (Ia-3, Fm-3m) was identified within the “as-prepared” samples. Moreover, the presence of Gd2O3 monoclinic phase (C2/m) which disappears during the thermal treatments was proved. In all thermally treated samples, it was observed the stabilization of an only Ia-3 phase. Fluorescence emission measurements in all studied samples the presence of Eu2+ (l= 430nm), whose intensity increases as long as the content of the monoclinic phase decreases of the Eu3+ percentage.
Peer reviewed
Gd2-xEuxO3 fluorescence, TP785-869, Eu2+, Spray Pirólisis, Clay industries. Ceramics. Glass, Spray Pyrolysis, Gd2-xEuxO3 fluorescencia, spray pyrolysis
Gd2-xEuxO3 fluorescence, TP785-869, Eu2+, Spray Pirólisis, Clay industries. Ceramics. Glass, Spray Pyrolysis, Gd2-xEuxO3 fluorescencia, spray pyrolysis
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