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Tuning of Magnetic Properties in Cobalt-Doped Nanocrystalline Bismuth Ferrite

Published online by Cambridge University Press:  07 July 2011

Gina Montes Albino
Affiliation:
Department of Mechanical Engineering, University of Puerto Rico at Mayagüez P.O. Box 9045, Mayagüez, Puerto Rico. 00681-9045 USA.
Oscar Perales-Pérez
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico at Mayagüez, Mayagüez, Puerto Rico 00680- 9044, USA.
Boris Renteria
Affiliation:
Department of Engineering Science and Materials, University of Puerto Rico at Mayagüez, Mayagüez, Puerto Rico 00680- 9044, USA.
Marco Galvez
Affiliation:
Department of Physics, University of Puerto Rico at Mayagüez, Puerto Rico 00980, USA.
Maxime J-F Guinel
Affiliation:
Department of Physics, University of Puerto Rico at Rio Piedras, PO Box 70377, San Juan, Puerto Rico 00936-8377 USA.
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Abstract

This study reports on the structural and magnetic characterizations of free-standing bismuth ferrite, BiFeO3, nanoparticles synthesized in polyol medium. Fine tuning of the ferrite magnetic properties was achieved by adding an excess bismuth species or doping with cobalt ions, coupled with thermal annealing. Crystalline Bi1-yCoyFeO3 powders (where ‘y’ ranges from 0.00 to 0.10) were produced after annealing the precursors for one hour at 700οC. The average crystallite size was calculated to be approximately 22 nm. We found that the synthesis under stoichiometric excess of Bi species (up to 10 at.%) promoted a more complete crystallization of the material, i.e., no precursor phases remained. Furthermore, both the saturation magnetization and the coercivity of the synthesized powders were strongly influenced by the concentration of Co. They increased from 0.13 emu/g and 19 Oe to 3.5 emu/g and 1183 Oe for pure BiFeO3 and 10 at.% Co-doped BiFeO3, respectively.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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