Evolution of the Structure and Magnetic Properties of Ni@C Composite Nanoparticles upon Annealing
- Authors: Uimin M.A.1,2, Novikov S.I.1, Konev A.S.1,2, Byzov I.V.1, Yermakov A.Y.1,2, Minin A.S.1,2, Privalova D.V.1, Gaviko V.S.1, Shchegoleva N.N.1
-
Affiliations:
- Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
- Ural Federal University Named after the First President of Russia B.N. Yeltsin
- Issue: Vol 120, No 3 (2019)
- Pages: 228-232
- Section: Electrical and Magnetic Properties
- URL: https://journals.rcsi.science/0031-918X/article/view/168327
- DOI: https://doi.org/10.1134/S0031918X19030141
- ID: 168327
Cite item
Abstract
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.
Keywords
About the authors
M. A. Uimin
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin
Author for correspondence.
Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108; Ekaterinburg, 620002
S. I. Novikov
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108
A. S. Konev
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin
Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108; Ekaterinburg, 620002
I. V. Byzov
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108
A. Ye. Yermakov
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin
Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108; Ekaterinburg, 620002
A. S. Minin
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences; Ural Federal University Named after the First President of Russia B.N. Yeltsin
Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108; Ekaterinburg, 620002
D. V. Privalova
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108
V. S. Gaviko
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108
N. N. Shchegoleva
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Email: uimin@imp.uran.ru
Russian Federation, Ekaterinburg, 620108