Synthesis of Co-Ni Alloy Particles with the Structure of a Solid Substitution Solution by Precipitation in a Supercritical Carbon Dioxide

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 as an antisolvent. The systems obtained have been characterized in detail using X-ray diffraction (XRD)...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-12, Vol.12 (24), p.4366
Main Authors: Nesterov, Nikolay, Pakharukova, Vera, Cherepanova, Svetlana, Yakushkin, Stanislav, Gerasimov, Evgeniy, Balaev, Dmitry, Semenov, Sergei, Dubrovskii, Andrey, Martyanov, Oleg
Format: Article
Language:English
Subjects:
Analysis
Bimetals
Carbon dioxide
Chemical precipitation
Chemical synthesis
Chromium-cobalt-nickel-molybdenum alloys
Co-Ni alloy
Cobalt alloys
Coercivity
Crystal lattices
Cubic lattice
Diffraction
Electron microscopy
Enrichment
Fourier transform infrared spectroscopy
Fourier transforms
Fragments
High resolution electron microscopy
Lattice parameters
Magnetic properties
Mechanical properties
Methods
Moisture content
Nanoparticles
Nickel
Nickel alloys
Parameter modification
Particle size
solid substitution solution
Solvents
Structure
Substitutes
supercritical fluids
Transmission electron microscopy
Water content
X-ray diffraction
X-rays
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Summary: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 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.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12244366