thermal evolution of nitrate precursors for processing of lanthanide perovskites
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ID: 240278
1998
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Abstract
Studies on thermal decomposition of ceramic powder with a general formula of (La1-x Ba x) (Co0.8 Fe0.2)O3 have been achieved. Precursors as nitrate solutions with additive of EDTA as complexion agent are used for powder processing. The black powders obtained are dried and their thermal evolution up to 1000ºC has been investigated by Differential Thermal Analysis. The powders was analyzed by EDX and ICP- AES, as well. It was established that the powder compositions are very close to the nominal one. The resulting DTA, TA, TG and DTG curves are analyzed as function of the composition and heating rate applied. At polythermal scanning regime three regions the powder thermal evolution are discussed. The correlation dependence has been examined for both Sr- and Ba- doped multicomponent lanthanide samples. The multicomponent nature of the samples have been shown on the base of the thermal treatment applied and XRD phase control carried out.<br><br>Se han realizado estudios sobre la descomposición térmica de polvos cerámicos de fórmula general (La1-x Ba x) (Co0.8 Fe0.2)O3. Se utilizaron como precursores soluciones de nitratos con EDTA como agente acomplejante. La evolución térmica del polvo negro obtenido se estudió hasta la temperatura de 1000 ºC por medio de análisis térmico diferencial. Los polvos se analizaron así mismo por EDX e ICP-A ES. Se estableció que la composición de los polvos esta muy próxima a la composición nominal. Se distingue tres regímenes en la evolución térmica. Se examina la dependencia con el contenido en lantanidas multicomponentes de pulsos con Sr y Ba. La naturaleza multicomponente se ha mostrado sobre la base del tratamiento térmico empleado y el análisis de las fases cristalinas.
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| Authors | ;Kozhukharov, V. S.;Machkova, M. S.;Brashkova, N. V. |
| Journal | medicinal chemistry (shariqah (united arab emirates)) |
| Year | 1998 |
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