INVESTIGADORES
BOTTA pablo Martin
congresos y reuniones científicas
Título:
Phase evolution and magnetic behavior of mechanochemically activated Fe3O4-La2O3-Y2O3 powder mixtures.
Autor/es:
A.A. CRISTÓBAL; P.M. BOTTA; P.G. BERCOFF; ESTEBAN F. AGLIETTI; H.R. BERTORELLO; JOSÉ M. PORTO LÓPEZ
Lugar:
Buenos Aires
Reunión:
Simposio; XV International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM); 2008
Resumen:
Polycrystalline Y0.5La0.5FeO3 powder was synthesized by mechanochemical activation of
Fe3O4La2O3Y2O3 reactive mixtures. X-ray diffraction was used to follow the evolution of the
formation of this orthoferrite. Peaks corresponding to reactants were no longer observed after 3 h of
activation, showing the completion of the reaction after this time. Magnetic hysteresis loops measured
at room temperature revealed a gradual decrease of saturation magnetization, consistent with the
consumption of ferrimagnetic Fe3O4 and the formation of antiferromagnetic Y0.5La0.5FeO3. However,
a small ferromagnetic contribution was observed even after 3 h of milling, which can be attributed to
a canting in the alignment of the two sub-lattices in the orthoferrite structure. This uncompensated
antiferromagnetism disappeared when the solid was heated, giving rise to a nearly antiferromagnetic
structure.0.5La0.5FeO3 powder was synthesized by mechanochemical activation of
Fe3O4La2O3Y2O3 reactive mixtures. X-ray diffraction was used to follow the evolution of the
formation of this orthoferrite. Peaks corresponding to reactants were no longer observed after 3 h of
activation, showing the completion of the reaction after this time. Magnetic hysteresis loops measured
at room temperature revealed a gradual decrease of saturation magnetization, consistent with the
consumption of ferrimagnetic Fe3O4 and the formation of antiferromagnetic Y0.5La0.5FeO3. However,
a small ferromagnetic contribution was observed even after 3 h of milling, which can be attributed to
a canting in the alignment of the two sub-lattices in the orthoferrite structure. This uncompensated
antiferromagnetism disappeared when the solid was heated, giving rise to a nearly antiferromagnetic
structure.3O4La2O3Y2O3 reactive mixtures. X-ray diffraction was used to follow the evolution of the
formation of this orthoferrite. Peaks corresponding to reactants were no longer observed after 3 h of
activation, showing the completion of the reaction after this time. Magnetic hysteresis loops measured
at room temperature revealed a gradual decrease of saturation magnetization, consistent with the
consumption of ferrimagnetic Fe3O4 and the formation of antiferromagnetic Y0.5La0.5FeO3. However,
a small ferromagnetic contribution was observed even after 3 h of milling, which can be attributed to
a canting in the alignment of the two sub-lattices in the orthoferrite structure. This uncompensated
antiferromagnetism disappeared when the solid was heated, giving rise to a nearly antiferromagnetic
structure.3O4 and the formation of antiferromagnetic Y0.5La0.5FeO3. However,
a small ferromagnetic contribution was observed even after 3 h of milling, which can be attributed to
a canting in the alignment of the two sub-lattices in the orthoferrite structure. This uncompensated
antiferromagnetism disappeared when the solid was heated, giving rise to a nearly antiferromagnetic
structure.