The environment of Nd~(3+), Sm~(3+), Yb~(3+) in chalcogenide glasses containing gallium and germanium

摘要

The first coordination sphere of Nd~(3+), Sm~(3+) and Yb~(3+) in glasses of the germanium chalcogenide-gallium chalcogenide system is studied by analyzing the optical transmission spectra of 0.85GeCh_2 centre dot 0.15Ga_2Ch_3 glasses (where Ch = S, Se or Te) doped with chalcogenide of these metals. It is shown that the spectral shift in absorption bands of Nd~(3+) is a linear function of the mean electronegativity of chalcogens in the glasses, which indicates the coincidence between the average composition of the first coordination sphere of neodymium ions and the composition of anionic subsystem in the glasses under investigation. Spectral shift of absorption bands of Sm~(3+) and Yb~(3+) is a non-linear function of the mean electronegativity of chalcogens in the glasses.