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Prenucleation formations in control over synthesis of CoFe2O4 nanocrystalline powders

  • Inorganic Synthesis and Industrial Inorganic Chemistry
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Abstract

Nanocrystalline cobalt ferrite powders were synthesized by hydrothermal treatment of co-precipitated hydroxides in the conditions of an external heating of the autoclave and under microwave heating of the reaction medium. In the microwave-heating mode, the prenucleation clusters formed under ultrasonic treatment of a suspended mixture of cobalt and iron hydroxides is transformed into CoFe2O4 nanocrystals during the first minute of synthesis at a temperature satisfying the equilibrium-existence conditions of cobalt ferrite. In the case of a slow external heating of the autoclave, there is no effect of this kind, which is attributed to the disintegration of the prenucleation clusters before the dehydration of the hydroxides to give crystalline cobalt ferrite becomes thermodynamically favorable. The main factor determining the increase in the formation rate of crystallites of CoFe2O4 nanopowders and the decrease in their size is the generation of prenucleation centers in the starting mixture of cobalt and iron hydroxides.

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Authors and Affiliations

  1. St. Petersburg State Electrotechnical University LETI, ul. Professora Popova 5, St. Petersburg, 197022, Russia

    O. V. Almjasheva

  2. Ioffe Physical Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia

    O. V. Almjasheva & V. V. Gusarov

Authors
  1. O. V. Almjasheva
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  2. V. V. Gusarov
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Correspondence to O. V. Almjasheva.

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Original Russian Text © O.V. Almjasheva, V.V. Gusarov, 2016, published in Zhurnal Prikladnoi Khimii, 2016, Vol. 89, No. 6, pp. 689−695.

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Almjasheva, O.V., Gusarov, V.V. Prenucleation formations in control over synthesis of CoFe2O4 nanocrystalline powders. Russ J Appl Chem 89, 851–856 (2016). https://doi.org/10.1134/S107042721606001X

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  • DOI: https://doi.org/10.1134/S107042721606001X

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