Thermal Treatment of Nanochains Composed of Amorphous ${\rm{Fe_{1-x}CO_{x}}}$ Nanoparticles Manufactured Through Magnetic-Field-Induced Co-reduction Reaction
2019
The thermal treatment of chains composed of amorphous Fe
1-x
Co
x
nanoparticles in two different oxygen atmospheres was studied. The nanostructures were manufactured using a magnetic-field-induced coreduction reaction, in which the precursor solutions containing 1:3 and 3:1 proportions of Fe
2+
and Co
2+
ions were reduced with sodium borohydride. The as-prepared nanochains were then heated for 30 min at 400 and 500 °C in dry air or argon containing about 1% oxygen. These processes led to their oxidation, and, as a result, the thermally treated Fe
1-x
Co
x
nanochains were transformed into cobalt ferrite. Heating at 500 °C in the air-containing atmosphere caused the nanomaterials to lose their nanochain structures. In accordance to room-temperature magnetic measurements, the as-prepared and thermally treated Fe
1-x
Co
x
nanochains were ferromagnetic. The highest saturation magnetization (MS) was measured for the Fe
1-x
Co
x
nanochains treated at 400 °C in dry air (105 A·m
2
/kg and 154 A·m
2
/kg for Fe
0.25
Co
0.75
and Fe
0.75
Co
0.25
, respectively), whereas the lowest M
S
was found for the Fe
0.25
Co
0.75
heated at 500 °C in dry air (17 A·m
2
/kg) and the Fe
0.75
Co
0.25
heated at 500 °C in argon (16 A·m
2
/kg).
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