Roseane Maria de MELO
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Francisco José Santos LIMA
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Ademir Oliveira da SILVA
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Cláudio César de Medeiros BRAGA
The lanthanium, neodymium and erbium maleates, were prepared starting from the oxides with hydrochloric acid for the formation of the salts, both in aqueous suspension, and after recrystallizade and dry, acid maleic was added. The obtained compositions were studied through the with EDTA complexometry, molar conductance thermogravimetry (TG), infrared spectroscopy, rays-X difratometry for the method of the powder and molecular modelling. The curves TG were obtained in atmosphere of synthetic air. The results made possible to establish the stochiometry and the degree of hydration of the compositions, that presented general formula: M(Mal)x.nH2O. The curves TG also allowed to verify the thermal stability, as well as the process of thermal decomposition, of these composed. The rays-X diffraction, for the method powder, showed that all the compositions possess crystalline structure, however, without formation of series isomorphous.
Synthesis and characterization of $$\hbox {BaNiO}_{3}$$ BaNiO 3 using a solid-state thermal decomposition method and the preparation of its stable aqueous suspension
