• Dubrovskii, Andrey
• Balaev, Dmitry
• Cherepanova, Svetlana
• Yakushkin, Stanislav
• Nesterov, Nikolay
• Gerasimov, Evgeny
• Pakharukova, Vera
• Semenov, Sergey
• Martyanov, Oleg

Abstract

<jats:p>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 CO2 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.</jats:p>

Topics

• Carbon
• x-ray diffraction
• transmission electron microscopy
• precipitation
• crystalline lattice
• coercivity
• spectroscopy