Hydrothermal synthesis, characterization, and magnetic properties of cobalt chromite nanoparticles
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The CoCr2O4 nanoparticles were prepared by hydrothermal treatment of chromium and cobalt oleates in a mixture of solvents (water and ethanol or pentanol) at various temperatures. The samples were further annealed at the temperatures from 300 to 500 °C. The obtained nanoparticles were characterized using powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), high-resolution TEM, scanning electron microscopy, thermogravimetric analysis, Raman and infrared spectroscopy, and magnetic measurements. The particle size, ranging from 4.4 to 11.5 nm, was determined from the TEM and PXRD methods. The tendency of particles to form the aggregates with the increasing annealing temperature has been observed. The magnetic measurements revealed that the typical features of the CoCr2O4 long-range magnetic order are suppressed in the nanoparticles.
KeywordsCobalt chromite Hydrothermal method Nanoparticles Size effect Multiferroic materials
This study was supported by the Grant Agency of the Czech Republic under Project No. P108/10/1250 and by the Long-Term Research Plan of the Ministry of Education of the Czech Republic (MSM0021620857). Magnetic measurements were performed in MLTL (see: http://mltl.eu), which is supported within the program of Czech Research Infrastructures (Project No. LM2011025).
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