Quantitative phase analysis of magnetic Fe@C nanoparticles

•Combination of NMR and Mossbauer spectroscopy can provide quantitative information about magnetic iron nanoparticles.•Annealing of the Fe@C nanoparticles leads to redistribution of the phase composition, with preserving core-shell structure.•Nanoscale effect which consists in an increase of the hyp...

Full description

Saved in:
Bibliographic Details
Published in:Materials today communications 2021-06, Vol.27, p.102382, Article 102382
Main Authors: Germov, Alexander Yu, Prokopyev, Dmitriy A., Mikhalev, Konstantin N., Goloborodskiy, Boris Yu, Uimin, Mikhail A., Yermakov, Anatoliy E., Konev, Alexander S., Minin, Artem S., Novikov, Sergey I., Gaviko, Vasiliy S., Murzakaev, Aidar M.
Format: Article
Language:English
Subjects:
57Fe NMR
Fe@C
Iron nanoparticles
Magnetic nanoparticles
Mossbauer spectroscopy
Phase analysis
Single domain state
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Combination of NMR and Mossbauer spectroscopy can provide quantitative information about magnetic iron nanoparticles.•Annealing of the Fe@C nanoparticles leads to redistribution of the phase composition, with preserving core-shell structure.•Nanoscale effect which consists in an increase of the hyperfine field in ferromagnetic single domain state is demonstrated. Substantial progress in the area of nanotechnology requires special quality of magnetic nanoparticles. Conventional methods of analysis are not always efficient to the study of nanoparticles. This paper is dedicated to the problem of quantitative analysis of the phase composition of ferromagnetic nanoparticles and the fundamental issue of transition to the single domain magnetic state. A comprehensive study of Fe@C nanoparticles has been carried out, including local 57Fe NMR and Mössbauer spectroscopy methods. It has been found that the cores of nanoparticles contain phases of α-iron, iron carbides, ferromagnetic and paramagnetic phases of iron-carbon FeCx solid solutions. Annealing of the nanoparticles leads to a significant redistribution of the phase composition and leads to an increase in magnetization. Also, a nanoscale effect has been found. It consists in observation of two lines in NMR spectra corresponding to multidomain and single-domain state. The hyperfine fields obtained by NMR and Mössbauer spectroscopy methods are discussed.
ISSN:2352-4928
2352-4928
DOI:10.1016/j.mtcomm.2021.102382