ISSN 1070-4272, Russian Journal of Applied Chemistry, 2016, Vol. 89, No. 5, pp. 846í849. © Pleiades Publishing, Ltd., 2016.
The text was submitted by the author in English.
Tiny magnetic particles are very attractive in a lot of
ﬁ elds [1–5]. Nanoparticles with high crystalline structure
are needed for a vast domain of technical applications.
When the particle size takes place in the nanoscale
range, superparamagnetic properties may be exhibited
by spinel ferrite nanoparticles. Superparamagnetic
properties in spin states macroscopic quantum tunneling
have a signiﬁ cant attraction for researchers . The
is a spinel ferrite with considerable thermal
and chemical stability, remarkable magnetic anisotropy
and saturation magnetization and proper mechanical
hardness [7, 8]. Different synthesis processes to generate
ferrite nanoparticles have been reported, such as: sol–
gel [9, 11], co-precipitation [12, 14], hydrothermal
[15, 17], mechano-chemical , refluxing ,
thermal decomposition , solvothermal method ,
microwave assisted method  laser ablation method
[23, 24] and precursor  methods. The combustion
method [25–29] is known as a fast method for synthesis
of complex nanoparticles.
We have generated cobalt spinel ferrite nanoparticles
by combustion method and after that the products were
ball milled at different times. Then, the structural and
the magnetic properties were characterized to investigate
their stability depending on the ball milling time.
For preparing cobalt ferrite nanoparticle in appropri-
ate ratio by the combustion method Fe(NO
O, and glycine (H
COOH) were dis-
solved in distilled water to obtain the precursor solution.
In the experiment 0.01 mol Fe(NO
O (4.04 g) and
0.005 mol Co(NO
O (1.4552 g) were used. We had
0.04 mol nitrates, and, thus, for a glycine to nitrates ratio
(G/N) = 0.6 we needed 0.024 mol (1.8016) glycine. All
the mentioned materials were solved in proper amount
of deionized distilled water. The precursor solution was
concentrated in a hot porcelain crucible until evaporation
of the excess free water. After that, spontaneous ignition
took place. Within several ten seconds, the combustion
reaction produced black; porous products were easily
ground to powder. CoFe
powder was ball milled by
three hardened stainless steel balls (diameter = 10 mm,
weight = 20.3 g). Milling process proceeded for two
separate times (1.5 h and 2.5 h) under dry conditions and
ambient atmosphere using Retch S 100 mill.
The X-ray diffraction (XRD) measurements were
carried out by (XPERT- MPD, Philips, CuK
at 40 kV and 40mA). Fourier transform infrared spec-
and Magnetic Stability Relative to Ball Milling
H. R. Dehghanpour
Physics Departemnt, Tafresh University, Tafres, Iran
Received March 3, 2016
Abstract—The combustion method has been utilized to generate cobalt spinel ferrite nanoparticles. The gener-
ated nanoparticles were ball milled for different times. Physical and chemical properties of the nanoparticles were
characterized by X- ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron
microscope (TEM), and vibrating sample magnetometer (VSM). Crystalline structure of the nanoparticles was
stable after ball milling. FTIR showed that oxygen-metal bonding was stronger after ball milling. Moreover, the
ball milled nanoparticles magnetically were harder than the nanoparticle without ball milling.