Europium(II) in glasses of the Al2O3-SiO2-MnO-Eu2O3 system |
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Authors: | S. A. Nemov A. V. Marchenko P. P. Seregin E. A. Tomil’tsev |
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Affiliation: | (1) St. Petersburg State Polytechnical University, ul. Politekhnicheskaya 29, St. Petersburg, 195251, Russia;(2) Herzen Russian State Pedagogical University, nab. Reki Moiki 48, St. Petersburg, 191186, Russia |
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Abstract: | Triply and doubly charged states of europium are revealed by 151Eu Mössbauer spectroscopy in the structure of glasses of the composition (mol %) 19.5Al2O3, 31.5SiO2, 26.5MnO, and 22.5Eu2O3. The isomer shifts in the Mössbauer spectra of Eu3+ and Eu2+ ions in the structure of glasses differ from the isomer shifts in the spectra of the Eu2O3 and EuO compounds. This difference is explained by the fact that the electron density at 151Eu nuclei is affected by the manganese and aluminum atoms, which are not bound directly to the europium atoms. The broadening of the spectra of the Eu2+ ions in glasses is caused by the nonuniform isomer shift. |
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