Structuring in fast-quenched ferrite compositions under plasma spraying

The influence of the quench rate on structuring in spinel ferrites has been studied. It has been found that, when the quench rate is increased, the equilibrium spinel structure gradually becomes disordered. At the first stage, the statistically homogeneous (or almost homogeneous) redistribution of c...

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Bibliographic Details
Published in:Technical physics 2017-06, Vol.62 (6), p.911-914
Main Authors: Lepeshev, A. A., Karpov, I. V., Ushakov, A. V., Nagibin, G. E., Dorozhkina, E. A., Karpova, O. N., Demin, V. G., Shaikhadinov, A. A.
Format: Article
Language:English
Subjects:
Catalysis
Chaos theory
Classical and Continuum Physics
Crystal lattices
Face centered cubic lattice
Ferrites
Heating
Iron compounds
Lattice sites
Physical Science of Materials
Physics
Physics and Astronomy
Plasma spraying
Powders (Particulate matter)
Quenching
Spinel
Spinel group
Thermodynamics
Topology
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Summary:The influence of the quench rate on structuring in spinel ferrites has been studied. It has been found that, when the quench rate is increased, the equilibrium spinel structure gradually becomes disordered. At the first stage, the statistically homogeneous (or almost homogeneous) redistribution of cations over crystal lattice sites has been observed. Then, the fcc lattice of the anion framework breaks down, the translational symmetry disappears, and topological chaos arises. The resulting cluster structural state is thermodynamically unstable, and heating of quenched ferrites causes stepwise energy liberation. As a result, the activity of ferrite powders in solid-state and catalytic reactions rises.
ISSN:1063-7842
1090-6525
DOI:10.1134/S1063784217060196