Study of mechanically synthesized carbide Fe7C3

Magnetic properties and hyperfine interactions in the carbide Fe 7 C 3 prepared by mechanical synthesis (MS) of α-Fe in toluene have been studied. It has been found that the boundary of temperature stability of the MS carbide does not exceed 775 K. The Curie temperature of the synthesized phase vari...

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Bibliographic Details
Published in:Physics of metals and metallography 2010-11, Vol.110 (5), p.474-484
Main Authors: Barinov, V. A., Tsurin, V. A., Surikov, V. T.
Format: Article
Language:English
Subjects:
Boundaries
Carbides
Chemistry and Materials Science
Curie temperature
Diffusion
Interaction parameters
Iron
Magnetic properties
Materials Science
Mathematical analysis
Metallic Materials
Phase Transformations
Structure
Toluene
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Summary:Magnetic properties and hyperfine interactions in the carbide Fe 7 C 3 prepared by mechanical synthesis (MS) of α-Fe in toluene have been studied. It has been found that the boundary of temperature stability of the MS carbide does not exceed 775 K. The Curie temperature of the synthesized phase varies between 509 and 525 K. The Mössbauer experiments ( 57 Fe) have demonstrated that the unit cell of Fe 7 C 3 contains 32 iron atoms distributed over five types of crystallographic positions with a multiplicity of 4: 8: 8: 8: 4. The hyperfine interaction parameters have been calculated for each nonequivalent position. It may be conjectured from the specific features of the decomposition at T ≥ 775 K that the most probable sequence of the phase transitions in the MS carbides Fe-C is → θ, where -Adcock carbide Fe 7 C 3 .
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X10110074