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Tetragonal nanocrystalline phases in oxides Re2O3
Russian version
DOI: 10.21883/PSS.2022.12.54397.427
Shmytko I. M.1, Kedrov V. V.1
1Osipyan Institute of Solid State Physics RAS, Chernogolovka, Russia
Email: shim@issp.ac.ru
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X-ray diffractometric studies of the structural state of simple rare-earth oxides Gd2O3, Sm2O3 and Eu2O3 were carried out, synthesized by different methods, at the first stages of crystal formation. It was found that the first crystalline phase of these compounds in the nanocrystalline state is not a known cubic modification with the spatial symmetry group S.G. Ia-3 (206), but tetragonal phases, whose spatial groups are not established due to the small number of strong reflexes in the nanostate. It is also shown that the same tetragonal phases are formed in industrial powders of these compounds subjected to long-term storage. Keywords: synthesis of Re2O3, glycine-nitrate method, nanocrystalline state, X-ray diffraction research methods, phase transitions.
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