[en] The work consisted of Ni_0_,_2Y_0_,_3Zn_0_,_5Fe_2O_4 composition ferrites synthesis ranging copper ions (Cu"+"2), cobalt (Co"+"2) and neodymium (Nd"+"3) whose objective is to evaluate the particle size by the method citrate precursor. After synthesis, the samples were calcined at 350° C and subsequently sintered at 1000° for 3 hours, with controlled heating and cooling rate. The calcined materials were characterized by XRD and SEM showed that the method of the precursor citrate is an effective method. The X-ray diffraction spectra and refinement show good agreement between the experimental peaks and the theoretical spectrum. In Scanning Electron Microscopy (SEM), the samples to 350° C/3h, have dimensions in the micrometer order in all compositions. The average size of the crystals are consistent with the higher definition and intensity of peaks of X-rays, that is, there is high correlation with those obtained by refining method. (author)