FORMATION CONDITIONS OF A MAGNETICALLY ORDERED PHASE ε-Fe_2O_3. A FMR IN SITU STUDY

摘要

The ferromagnetic resonance (FMR) method in situ is used to study the initial stages of the formation of ε iron oxide nanoparticles deposited on silica gel at temperatures up to 600°C. It is shown that at hightemperature treatment of starting samples obtained by impregnation with an iron(II) sulfate solution, supermagnetic ε-Fe_2O_3/SiO_2 nanoparticles form with a narrow size distribution. An analysis of the FMR data in comparison with the data of other methods enables the formulation of the formation conditions for systems of deposited ε-Fe_2O_3 nanoparticles without other polymorph impurities