Author： Nemov S. Seregin P. Tomil’tsev E. Tagil’tseva N.
Publisher： MAIK Nauka/Interperiodica
ISSN： 1087-6596
Source： Glass Physics and Chemistry, Vol.32, Iss.2, 2006-03, pp. : 257-259
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Abstract
The structure of glasses based on fluorides of alkaline-earth metals, aluminum, and europium, in which aluminum fluoride is partially replaced by aluminum nitride, is investigated by 151Eu Mössbauer spectroscopy. It is found that these glasses contain europium atoms in two oxidation states (+2 and +3). The isomer shifts of the Mössbauer spectra of Eu3+ and Eu2+ ions entering into the composition of the fluoride glasses are somewhat different from the isomer shifts of the Mössbauer spectra of EuF3 and EuF2 compounds. This difference is explained by the effect of the alkaline-earth metal and aluminum atoms (not bound directly to the europium atoms) on the electron density at the 151Eu nuclei. The broadening of the Mössbauer spectra of the Eu2+ ions in the fluoride glasses is explained by the nonuniform isomer shift.
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