Kassabova-Zhetcheva V.D.2024-07-102024-07-102024-07-102024-07-102009-07-101895-10661644-362410.2478/s11532-009-0054-7SCOPUS_ID:67649863857https://rlib.uctm.edu/handle/123456789/165The citrate precursor has been used to synthesize nanocrystalline Mg-Zn-ferrites. The nature of the prepared precursor is characterized and compared with those of the precursors studied earlier, prepared by the same process. The study has been performed by inorganic and organic elemental analyses, Fourier Transformed Infrared Spectroscopy (FTIR), Mössbauer spectroscopy, X-ray Photoelectron Spectroscopy (XPS), Electron Paramagnetic Resonance (EPR), Electronic absorption spectrometry in the UV-VIS region, Differential Thermal analysis/ Thermogravimetry (DTA-TG) analyses, and X-ray diffraction (XRD) analysis. The collected results determined the precursor as a coordination polymer with monomer unit (NH4)4{M [Fe(C6H5O7)2]2}, where M = Zn or Mg. © Versita Warsaw and Springer-Verlag Berlin Heidelberg 2009.enArticle