Premium
Effects of Ultrasonic Agitation on the Structural and Magnetic Properties of CoFe 2 O 4 Nanocrystals
Author(s) -
Almeida Silva Anielle Christine,
Gratens Xavier,
Chitta Valmir Antonio,
Franco Sinésio Domingues,
Souza da Silva Ricardo,
Condeles José Fernando,
Dantas Noelio Oliveira
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402563
Subject(s) - superparamagnetism , nanocrystal , annealing (glass) , chemistry , cobalt , magnetization , infrared spectroscopy , octahedron , scanning electron microscope , analytical chemistry (journal) , particle size , crystallography , spectroscopy , nuclear magnetic resonance , nanotechnology , chemical engineering , materials science , inorganic chemistry , crystal structure , metallurgy , composite material , organic chemistry , magnetic field , physics , quantum mechanics , engineering
Cobalt ferrite nanocrystals (CoFe 2 O 4 ) were synthesized by means of ultrasonic agitation and afterward subjected to different annealing temperatures. The structural and morphological properties of the nanocrystals were investigated by means of X‐ray diffraction and scanning electron microscopy. The results showed that the samples were composed of CoFe 2 O 4 monophase nanocrystals. The particle size increased with increasing annealing temperatures. Infrared spectroscopy and magnetization showed that the samples exhibited the usual features of CoFe 2 O 4 nanocrystals. Superparamagnetism was not observed at room temperature. However, the results indicated that the samples could be considered single‐domain particles with blocking temperatures greater than 300 K. Both infrared and magnetic results indicated possible diffusion of cobalt ions from tetrahedral to octahedral sites as a function of the annealing temperature.