Evolution of the Structure and Magnetic Properties of Ni@C Composite Nanoparticles upon Annealing
| Autor: | S. I. Novikov, N. N. Shchegoleva, D. V. Privalova, I. V. Byzov, V. S. Gaviko, M. A. Uimin, A. S. Konev, Artem S. Minin, A. Ye. Yermakov |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Annealing (metallurgy) Slow cooling chemistry.chemical_element Nanoparticle Atmospheric temperature range Condensed Matter Physics 01 natural sciences Condensed Matter::Materials Science Nickel chemistry Chemical engineering 0103 physical sciences Materials Chemistry Chemical stability Composite nanoparticles 010306 general physics Solid solution |
| Zdroj: | Physics of Metals and Metallography. 120:228-232 |
| ISSN: | 1555-6190 0031-918X |
| DOI: | 10.1134/s0031918x19030141 |
| Popis: | Nanopowders Ni@C synthesized by gas condensation have a core-shell structure. The size of the core is 2–10 nm and the thickness of the shell is 1–3 nm. The changes in the magnetic properties and the structure of these particles upon annealing in the 100–1100°C temperature range are investigated in this work. Analysis of changes in the magnetic properties, the structure, and the chemical stability shows that the core of the particles in the initial state after synthesis is a supersaturated solid solution of carbon in nickel, which decomposes into nickel and carbon upon high-temperature annealing. Rather slow cooling of nickel particles causes the carbon shell to form. The shell ensures their chemical stability. |
| Databáze: | OpenAIRE |
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