Synthesis and magnetic properties of cobalt ferrite (CoFe2O4) nanoparticles prepared by wet chemical route


MAAZ K., MUMTAZ A., Hasanain S. K. , Ceylan A.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, cilt.308, ss.289-295, 2007 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 308 Konu: 2
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.jmmm.2006.06.003
  • Dergi Adı: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
  • Sayfa Sayıları: ss.289-295

Özet

Magnetic nanoparticles of cobalt ferrite have been synthesized by wet chemical method using stable ferric and cobalt salts with oleic acid as the surfactant. X-ray Diffraction (XRD) and Transmission Electron Microscope (TEM) confirmed the formation of single-phase cobalt ferrite nanoparticles in the range 15-48 urn depending on the annealing temperature and time. The size of the particles increases with annealing temperature and time while the coercivity goes through a maximum, peaking at around 28 run. A very large coercivity (10.5 kOe) is observed on cooling down to 77 K while typical blocking effects are observed below about 260 K. The high field moment is (c) 2006 Elsevier B.V. All rights reserved.