Chapter 5
Peculiarities of the Crystal-Chemical
Structure of Spinel Ferrites Co x Fe 3-x O 4
(0.25 ≤ x ≤1) Obtained Under the Action
of a Low-Temperature Contact
Nonequilibrium Plasma
L. A. Frolova, O. A. Pivovarov, O. A. Kushnerov, and N. M. Tolstopalova
5.1 Introduction
The interest of researchers in the Co x Fe 3-x O 4 system has grown significantly in
recent decades. This is due to the use of cobalt ferrites for the manufacturing of
high-frequency devices in magnetic resonance imaging and biotechnology and due
to high cubic magnetocrystalline anisotropy, high coercivity, moderate saturation of
magnetization, and its ability to reduce magnetic losses at high frequencies [1–3].
It is on the basis of cobalt ferrite that the systems with special properties have been
developed [4].
One way to improve the magnetic properties of ferrite powders is to improve the
structure of the starting material. Hydrophase synthesis methods, including those
initiated by various physical fields, are the basis for the creation of promising
and high-tech ferrite materials [5], in connection with which the patterns of their
formation are the object of in-depth study. A detailed study of the model reaction
mechanism, which underlies the formation of ferrites, indicates the complex nature
of this process, and the single-phase structure of ferrite is not a guarantee of its
chemical homogeneity. The ability of ferrites to form continuous series of solid
solutions, which also contain a different amount of oxygen and vacancies, leads
to the fact that within the same phase, there can be significant gradients in the
L. A. Frolova () · O. A. Pivovarov
Ukrainian State Chemical Technology University, Dnipro, Ukraine
O. A. Kushnerov
Oles Honchar Dnipropetrovsk National University, Dnipro, Ukraine
N. M. Tolstopalova
National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv,
Ukraine
© Springer International Publishing AG, part of Springer Nature 2018
O. Fesenko, L. Yatsenko (eds.), Nanochemistry, Biotechnology, Nanomaterials,
and Their Applications, Springer Proceedings in Physics 214,
https://doi.org/10.1007/978-3-319-92567-7_5
79
Peculiarities of the Crystal-Chemical
Structure of Spinel Ferrites Co x Fe 3-x O 4
(0.25 ≤ x ≤1) Obtained Under the Action
of a Low-Temperature Contact
Nonequilibrium Plasma
L. A. Frolova, O. A. Pivovarov, O. A. Kushnerov, and N. M. Tolstopalova
5.1 Introduction
The interest of researchers in the Co x Fe 3-x O 4 system has grown significantly in
recent decades. This is due to the use of cobalt ferrites for the manufacturing of
high-frequency devices in magnetic resonance imaging and biotechnology and due
to high cubic magnetocrystalline anisotropy, high coercivity, moderate saturation of
magnetization, and its ability to reduce magnetic losses at high frequencies [1–3].
It is on the basis of cobalt ferrite that the systems with special properties have been
developed [4].
One way to improve the magnetic properties of ferrite powders is to improve the
structure of the starting material. Hydrophase synthesis methods, including those
initiated by various physical fields, are the basis for the creation of promising
and high-tech ferrite materials [5], in connection with which the patterns of their
formation are the object of in-depth study. A detailed study of the model reaction
mechanism, which underlies the formation of ferrites, indicates the complex nature
of this process, and the single-phase structure of ferrite is not a guarantee of its
chemical homogeneity. The ability of ferrites to form continuous series of solid
solutions, which also contain a different amount of oxygen and vacancies, leads
to the fact that within the same phase, there can be significant gradients in the
L. A. Frolova () · O. A. Pivovarov
Ukrainian State Chemical Technology University, Dnipro, Ukraine
O. A. Kushnerov
Oles Honchar Dnipropetrovsk National University, Dnipro, Ukraine
N. M. Tolstopalova
National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv,
Ukraine
© Springer International Publishing AG, part of Springer Nature 2018
O. Fesenko, L. Yatsenko (eds.), Nanochemistry, Biotechnology, Nanomaterials,
and Their Applications, Springer Proceedings in Physics 214,
https://doi.org/10.1007/978-3-319-92567-7_5
79