2012
F. Sánchez-De Jesús, C.A. Cortés-Escobedo, A.M. Bolarín-Miró, I. A. Lira-Hernández, G. Torres-Villaseñor, (2012). Crystal structure and mixed ionic-electronic conductivity of mechanosynthesized La1-xCaxMnO3 (0 Abstract The aim of this work was to study the relationship between the crystalline structure, the mixed ionic-electronic conductivity and the calcium content in calcium-doped lanthanum manganites (CLM, La1-xCaxMnO3) synthesized by reactive ball milling. Mechanosynthesis was employed to produce nanocrystalline CLM with varying calcium content (x = 0 - 0.8 in increments of 0.1). Powders of Mn2O3, La2O3 and CaO mixed in the stoichiometric ratio were used as raw materials. The mechanosynthesis was carried out using a high-energy shaker mixer/mill. X-ray powder diffraction and Rietveld refinement were used to determine the crystalline structure as a function of calcium content. The four-point probe resistivity test was used to measure the electrical resistivity of the compacted and sintered powders using a DC milli-ohm meter. The results showed that the substitution of the La3+ ion by the Ca2+ ion during mechanosynthesis only changed the lattice parameters but not the orthorhombic Pnma structure. The mixed ionic-electronic conductivity increased with the Ca2+ content. The best conductivity was observed for the composition of La0.2Ca0.8MnO3 SÍNTESIS Y CARACTERIZACIÓN DE CÁTODOS DE CaxLa1-xMnO3 PARA SU APLICACIÓN EN CCOS CARACTERIZACIÓN DE FERRITA DE MANGANESO OBTENIDA POR MECANOSÍNTESIS Mechanosynthesis and magnetic characterization of nanocrystalline manganese ferrites SÍNTESIS DE NiMn2O4 ASISTIDA MEDIANTE MOLIENDA DE ALTA ENERGÍA A PARTIR DE MEZCLAS DE NiO-MnO Estabilidad térmica de manganitas tipo La1-xCaxMnO3 obtenidas mediante mecanosíntesis MECANOSÍNTESIS DE MANGANITAS DE LANTANO: EFECTO DE LA RELACIÓN EN PESO BOLAS:POLVO
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