Properties of Ga-Doped Magnetite Nanoparticles

K. Rećkoa, U. Klekotkab, B. Kalska-Szostkob, D. Soloviovc, d, e, D. Satułaa, J. Waliszewskia, c aUniversity of Bialystok, Faculty of Physics, 15-245 Białystok, ul. K. Ciołkowskiego 1L, Poland bUniversity of Bialystok, Institute of Chemistry, 15-245 Białystok, K. Ciołkowskiego 1K, Poland cFrank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Moscow region, Russia dMoscow Institute for Physics and Technology, Dolgoprudny, 141701, Russia eTaras Shevchenko National University of Kyiv, Kyiv, 01033, Ukraine

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This paper reports our progress toward developing the best methods to prepare Ga-doped magnetite nanoparticles. Results of X-ray powder diffraction, small angle neutron scattering and the Mössbauer spectroscopy measurements of core-shell Ga0.2Fe2.8O4/ Fe3O4 and Fe3O4/Ga0.2Fe2.8O4 nanoparticles are presented. They all were found to crystallize in the cubic structure. The diffraction data confirmed high sensitivity of the phase homogeneity depending on the preparation method. The volume of the unit cell has been proved to be independent of the gallium content. X-ray measurements disclosed that Ga atoms occupy preferentially (A) sites, while (B) sites are entirely occupied by Fe cations. The Mössbauer results are fully consistent with diffraction ones when Ga0.2Fe2.8O4 is a core of core-shell systems. The small angle neutron scattering was performed in order to test the shape and size of particles.

DOI:10.12693/APhysPolA.134.998 PACS numbers: 61.05.fm, 61.05.fg, 61.05.Qr, 61.46.-w, 76.80.+y