Mssbauer Investigation of the Europium State
in Fluoride Glasses

S. A. Nemov, P. P. Seregin, E. A. Tomil’tsev, and N. O. Tagil’tseva

St. Petersburg State Polytechnical University, Politekhnicheskaya ul. 29, St. Petersburg, 195251 Russia

Received September 7, 2005

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 spec-
troscopy. 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 differ-
ence 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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