Structural and Magnetic Properties of NiCuZn Ferrite Nanoparticles Prepared by Self- Combustion method

S. E. JACOBO; J. C. APHESTEGUY; N.N. SCHEGOLEVA; G.V. KURLYANDSKAYA

DIFFUSION AND DEFECT DATA, SOLID STATE DATA. PART B, SOLID STATE PHENOMENA

Trech Publication

Año: 2011 vol. 168 p. 333 - 340

1012-0394

 NiCuZn  ferrites  were  prepared  by  the  sol-gel  self-combustion  method.  Nanosized, homogeneous and highly reactive powders were obtained at relatively low temperatures. In present work  the  variations  of  structural,  magnetic,  and  microwave  properties  of  NiCuZn  ferrite nanoparticles were studied as a function of the annealing temperature. The analysis of XRD patterns showed  that only  the  spinel phase  is present. Cell parameters slightly vary with  thermal  treatment while  a  crystalline  size  increases. Magnetic  nanoparticles  were  mixed  with  an  epoxy  resin  for reflectivity studies with a microwave vector network analyzer using the microwave-guide method in the  range  of  7.5  to  13.5GHz.  Static  saturation  magnetization  value  (measured  by  SQUID)  and microwave  absorption  show  clear  dependence  on  the  annealing  temperature/particle  size  and  the absorption maximum moves towards the higher frequencies with an increase in the average size of the particles.