1. Synthesis of Co-Ni Alloy Particles with the Structure of a Solid Substitution Solution by Precipitation in a Supercritical Carbon Dioxide.
- Author
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Nesterov, Nikolay, Pakharukova, Vera, Cherepanova, Svetlana, Yakushkin, Stanislav, Gerasimov, Evgeniy, Balaev, Dmitry, Semenov, Sergei, Dubrovskii, Andrey, and Martyanov, Oleg
- Subjects
SOLID solutions ,SUPERCRITICAL carbon dioxide ,CRYSTAL lattices ,TRANSMISSION electron microscopy ,LATTICE constants ,ALLOYS - Abstract
Mixed Co-Ni bimetallic systems with the structure of a solid substitution solution have been synthesized using the supercritical antisolvent precipitation (SAS) method, which uses supercritical CO
2 as an antisolvent. The systems obtained have been characterized in detail using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Fourier-transform infrared (FTIR) spectroscopy, and magnetostatic measurements. It has been found that Co-enriched systems have a defective hexagonal close-packed (hcp) structure, which was described by a model which embedded cubic fragments of packaging into a hexagonal close-packed (hcp) structure. It has been shown that an increase in water content at the precipitation stage leads to a decrease in the size of cubic fragments and a more uniform distribution of them in Co-enriched systems. It has also been shown that mixed systems have the greatest coercivity in the line of samples. Ni-enriched bimetallic systems have a cubic close-packed (ccp) structure with modified crystal lattice parameters. [ABSTRACT FROM AUTHOR]- Published
- 2022
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