Sonochemical preparation of nanosized amorphous NiFe2O4 particles

Kurikka V.P.M. Shafi, Yuri Koltypin, Aharon Gedanken, Ruslan Prozorov, Judit Balogh, Janos Lendvai, Israel Felner

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Nanosized amorphous NiFe2O4 powder was prepared by sonochemical decomposition of solutions of volatile organic precursors, Fe(CO)5 and Ni(CO)4, in decalin at 273 K, under an oxygen pressure of 100-150 kPa. The amorphous nature of these particles was confirmed by various techniques, such as SEM, TEM, electron microdiffraction, and X-ray diffractograms. Magnetic measurements, Mössbauer, and EPR spectral studies indicated that the as-prepared NiFe2O4 ferrite particles were superparamagnetic. The Mössbauer spectrum of the crystallized sample showed a clear sextet pattern, with hyperfine field values of 500 and 508 kOe for A (tetrahedral) and B (octahedral) sublattices, respectively, of the inverse spinel NiFe2O4. Saturation magnetization of the annealed sample (25 emu/g) was significantly lower than that for the reported multidomain bulk prticles (55 emu/g), reflecting the ultrafine nature of the sample. Thermogravimetric measurements with a permanent magnet gave Curie temperatures of 440°C for amorphous and 560°C for the crystallized forms.

Original languageEnglish
Pages (from-to)6409-6414
Number of pages6
JournalJournal of Physical Chemistry B
Issue number33
StatePublished - 14 Aug 1997


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