Samples of α-iron and iron carbide (Fe3C) nanoparticle agglomerates (with a typical size of α-iron nanoparticles in the 14-15 nm range) dispersed at a concentration of 0.1 % in nonmagnetic matrix of wax have been prepared. The samples have been characterized by XRD and SEM spectroscopy. Magnetic resonance measurements of the samples, using X-band electron paramagnetic resonance spectrometer, have been carried out in 300-8 K temperature range. A very intense and very broad magnetic resonance line has been recorded in all samples with various weight ratios of α-irons and iron carbides. For samples at room temperature the resonance signal could be fitted by one (for low iron concetration) or two (for high iron concentration) Lorentzian-shape lines: one centered near zero magnetic field (around 20-100 mT), and the other at higher magnetic field (about 520-550 mT). Both lines displayed a strong decrease of their integral intensity with decreasing concentration of iron. With increasing concentration of the Fe3C nanoparticles the intensity and the linewidth of the resonance absorption signal shows an unusual behavior as a function of temperature. The shape of resonance line is changing with temperature; it becomes more flat at lower temperatures. Amplitude of the resonance absorption signal is decreasing with temperature down to 40-60 K and then increasing again with further temperature decrease down to 8 K. The resonance line is shifting with temperature increse towards higher magnetic fields and the integral intensity is increasing.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/979 must be provided.

1. Welcome address
2. Carbon nanotubes applications for drug and gene delivery
3. Europejska Platforma Technologiczna Nanomedycyny
4. ZrO₂:Tb nanopowders obtained by coprecipitation method
5. ZnFe₂O₄/ZnO core-shell particles obtained by coprecipitation route
6. Raman scattering from ZnO doped with Fe, Mn and Co nanoparticles
7. Hydrothermal Synthesis of ZnAl₂O₄ Spinel
8. Comparison of Au/ZrO₂ materials prepared by precipitation and impregnation methods
9. Low-frequency Raman scattering from transition-metal-doped ZnO nanoparticles
10. Surface chemistry of Pr-doped nanocrystalline zirconia
11. Effect of iron addition on the properties of ZnO obtained by precipitation
12. Iron-carbon nanofillers for polymers
13. Poisoning of iron catalyst with sulfur
14. Structure and physical properties of TiC nano- and microparticle filled polyester and polyurethane
15. FMR study of carbon coated cobalt nanoparticles dispersed in paraffin
16. Temperature dependence of the FMR spectra of polymer composites with nanocrystalline α-Fe/C filler
17. Catalytic decomposition of ethylene on nanocrystalline cobalt
18. Electrical conductivity of TiC and (Ti,W)C ceramic samples
19. Ferromagnetic resonance from nanoparticle agglomerates in nonmagnetic matrices
20. Magnetic resonance study of PTMO - block - PET copolymer filled with a mixture of Fe₃O₄ and Fe₃C nanoparticles at low concentration
21. Surface diffusion of potassium from iron catalyst
22. Studies of the initial stage of the carburisation of nanocrystalline iron with methane
23. KINETICS OF CARBON DEPOSIT FORMATION FROM DECOMPOSITION OF METHANE ON NANOCRYSTALLNE IRON SURFACE
24. Nanocrystallline iron-carbon fillers for polymers
25. Preparation of the Nanocrystalline Iron Carbide in Reaction of Iron with Methane or Methane/Hydrogen Mixture