Mathematics & Physics 2016, 9(4), 459–462 УДК 537.632.3 A Comparative Study of γ-Fe2O3 and ϵ-Fe2O3 Nanoparticles Arising in Borate Glasses Doped with Fe and Gd Oxana S. Ivanova∗ Ruslan D. Ivantsov† Irina S. Edelman‡ Eleonora A.Petrakovskaja§ Kirensky Institute of Physics SB RAS Akademgorodok, 50/38, Krasnoyarsk, 660036 Russia Received 25.08.2016, received in revised form 10.10.2016, accepted 10.11.2016 Formation and properties of the iron oxides γ-Fe2O3 and ϵ-Fe2O3 nanoparticles arising in glasses of basic compositions Ge2O-K2O-Al2O3-B2O3 and K2O-Al2O3-B2O3 doped with different concentrations of Fe2O3 and Gd2O3 and subjected to the additional thermal treatment are studied. <...> The X-ray diffraction, TEM microscopy, magnetooptical effects, and electron spin resonance study allow elucidating the matrix and Gd role in determining the nanoparticle properties. <...> Contrary to γ-Fe2O3, compound ε-Fe2O3 refers to the unstable phase and therefore a long time it remains poorly studied until the possibility was shown to synthesize ε-Fe2O3 nanoparticles in some matrices [1–3]. <...> Recently, we presented the first study of the ε-Fe2O3 nanoparticles synthesized in the oxide glass matrix [5]. <...> The glasses were subjected to the additional thermal treatment at 560 ◦C. The XRD analysis was done at the ”Structural Materials Science” beamline in the Kurchatov Synchrotron Radiation Centre. <...> The visualization of particles was carried out using electron microscope JEM-2200FS (JEOL Ltd.) operating in the high-resolution (HRTEM), high-angle annular dark-field scanning (STEM-HAADF) transmission modes and energy dispersive X-ray analysis (EDX). <...> Magnetic properties of the samples were studied with a superconducting quantum interference device (SQID) magnetometer at temperatures 78–300 K in the applied magnetic field up to 2 T. Magnetic circular dichroism (MCD) was measured in the energy interval 2–2.9 eV at temperatures 300 and 90 K. Nanoparticles of γ-Fe2O3 were identified with XRD (Fig. 1a) and TEM in sample 1. <...> All rights reserved c – 459 – Oxana S. Ivanova, Ruslan D. Ivantsov, Irina S. Edelman, Eleonora A.Petrakovskaja A Comparative Study . . . (Fig. 1b). <...> TEM images and EDX elemental mapping revealed some common features for the both types of glasses: Fe <...>