Europium(II) in glasses of the Al<Subscript>2</Subscript>O<Subscript>3</Subscript>-SiO<Subscript>2</Subscript>-MnO-Eu<Subscript>2</Subscript>O<Subscript>3</Subscript> system期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Europium(II) in glasses of the Al2O3-SiO2-MnO-Eu2O3 system

Authors:	S. A. Nemov A. V. Marchenko P. P. Seregin E. A. Tomil’tsev

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

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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