Synthesis of multielement ferrites and their silica composites |
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Authors: | A A Rodríguez-Rodríguez O S Rodríguez-Fernández J G Osuna-Alarcón Sagrario M Montemayor |
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Institution: | 1.Universidad Autónoma de Coahuila,Saltillo,Mexico;2.Centro de Investigación en Química Aplicada,Saltillo,Mexico |
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Abstract: | Ferrites of composition M0.2Co0.4Zn0.4Fe2O4 with M = Cu2+, Mn2+ and Ni2+ were prepared by citrate complex method. Later, their composites with silica have also been obtained by a simple route. The
citrate complex precursors of multielement ferrites were characterized by FTIR spectroscopy and thermal analysis, been found
a similar behavior for the three systems. The thermal treatment (at 400, 600 and 800 °C) of precursors gives, as result, the
spinel type cubic ferrite pure when the ions substituted were copper and nickel; when manganese was used an hematite phase
was obtained as contaminant at 800 °C. The presence of all ions involved and the particle size was corroborated by EDX analysis
and measured from a TEM micrograph, respectively. The magnetic parameters related to magnetic properties, magnetization and
coercivity, were different depending of the chemical composition of the ferrite and the thermal treatment temperature, as
it was expected. At room temperature, the values obtained were near to those reported for Co-ferrite in bulk. The synthesis
route of the composites M0.2Co0.4Zn0.4Fe2O4-SiO2, proposed in this work, gives as result magnetic nanoparticles in an amorphous silica matrix. Their magnetic properties were
depending on weight percentage of the magnetic phase in the composite. |
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