The study of the peculiarities of the formation of the nanoparticles FeCo-alloy in the composition of
metal-carbon nanocomposites FeCo/C.
Structure, phase composition and kinetic processes of synthesis of nanocomposites FeCo/C by methods
of Mossbauer spectroscopy were studied. This allowed us to establish the peculiarities of formation of nanoparticles
FeCo alloy in the composition of the nanocomposites. The nanocomposites were synthesized by
the IR-pyrolysis at temperatures of precursors of 300 - 800 °C on the basis of polyacrylonitrile (PAN), iron
acetylacetonate and cobalt acetate.
Also it is established that an increase in the average size of nanoparticles FeCo with increasing temperature
synthesis is occurred. In the temperature range of synthesis of 600-800 °C the size varies from 9-
10 to 16-18 nm, respectively.
The features the phase transitions and phase composition of the metal-carbon nanocomposites FeCo / C
were studied by Mossbauer spectroscopy. Nanocomposites were synthesized in the temperature range of T
= 300-800 °C. It was shown that the samples synthesized at T = 300 °C contains of superparamagnetic nanoparticles
of magnetite and amorphous oxide of iron only. The process of forming nanoparticles of alloy
FeCo occurs within the temperature range 500-600 ° C due to the recovery of amorphous iron oxide and
magnetite as well as them dissolving in a phase of cobalt. The growth of size of nanoparticles of alloy by
agglomeration and dissolution of iron in the alloy nanoparticles occurs only at the temperature range of
synthesis 600-800 ° C. This is confirmed by a decrease of the content of Fe, which associated with carbon
and it is consistent with the results of phase and structural studies, carried out in previous works
