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- W4285093081 abstract "Mixtures of hydrated oxides Eu2O3∙nH2O and Ga2O3∙nH2O were isolated from solutions of europium and gallium nitrates by the method of co-shrinkage. By subsequent calcination at 800 oC for 24 hours, europium gallate was obtained. The identification of the product was carried out by X-ray phase analysis and IR spectroscopy. Its structure has been found to correspond to the structural type of EuGaO3 perovskite of orthorhombic symmetry (e.g. Pbnm, crystal lattice parameters: a = 0.5000 nm, b = 0.7565 nm, c = 0.5213 nm). A series of narrow bands characteristic of Eu3+ ions associated with 5D0 → 7Fj transitions of 4f-electrons was registered in the luminescence spectrum of EuGaO3. The stripes are inhomogeneously widened at the base with a weakly pronounced Stark structure. The most intense is the 5D0 → 7F2 doublet band of the electron transition with maxima located at wavelengths of 609 nm and 630 nm. The excitation of luminescence occurs as a result of the transfer of the energy of the phonon vibrational motion of the matrix to the excited levels of Eu3+ ions. A corresponding structured band was registered in the excitation spectrum at wavelengths < 350 nm. The short-wave part of the band is associated with the transition of 2p-electrons of O2- ions to the 4f-orbital of europium ions in an oxide environment." @default.
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- W4285093081 date "2022-07-12" @default.
- W4285093081 modified "2023-09-25" @default.
- W4285093081 title "Синтез и исследование оптических свойств галлата европия перовскитной структуры" @default.
- W4285093081 doi "https://doi.org/10.25712/astu.2072-8921.2022.02.017" @default.
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