Hyperfine Interactions at Lanthanide Sites in Europium Doped Oxide Glasses

Abstract

A series of europium doped Na 2 0-B 2 0 3 -Si0 2 , Pb0-Ge0 2 and Zn0-Te0 2 glasses was investigated by means of 5l Eu Mössbauer spectroscopy. The distortion of the Eu sites has been evaluated in the Na 2 0-B 2 0 3 -Si0 2 glasses by means of the quadrupolar interaction parameter and the asymmetry parameter; the disorder has been estimated by the line width. The occupancy of the sites in the borosilicate glasses is discussed. The correlation of the isomer shift with the optical basicity of the glass is discussed in terms of the degree of covalence of the Eu-0 bond.

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

“…In particular, one of these metals is europium. In contrast to the majority of rare-earth metals, europium can be stabilized in two states; therefore, by varying the ratio between the oxidized (Eu 3+ ) and reduced (Eu 2+ ) species, it is possible to control the optical characteristics of the material.It has been established using 151 Eu Mössbauer spectroscopy that, in oxide and fluoride glasses, europium is stabilized in the Eu 3+ state [1][2][3][4][5][6][7][8][9][10][11][12]. In order to obtain the reduced form of europium in a glass, it is necessary to use a strong reducing agent of the AlN type [1,12].…”

Europium preconcentration by filtration of ternary complexes prior their determination by XRF spectrometry

“…Different host materials doped with Eu were found in the literature 11 and some examples of them and their compositions are shown in Table 1.…”

Mössbauer investigation of the europium state in fluoride glasses

“…This method has found wide application in the investigation of oxide (silicate, germinate, borate, phosphate, and aluminate) glasses [1][2][3][4][5][6][7][8]. It turned out that, depending on the technique used for synthesizing glasses, europium atoms can occur in both Eu 3+ and Eu 2+ states.…”