Anion Coordination Environments around Cations in Chlorofluoroaluminate and Chlorofluorocadmate Glasses Containing Eu³⁺

Abstract

The present work explores the characteristics of rare-earth ions-containing chlorofluoride glasses, in which the anion-coordination environments around rare-earth ions are changeable by the substitution of Cl for F. In this study, chlorofluoroaluminate and chlorofluorocadmate glasses with substitutions of Cl for F were developed, whose compositions are 40AlF₃⋅(20-x)BaF₂⋅xBaCl₂⋅20CaF₂⋅17YF₃⋅3EuF₃ in mol% (x=0, 3, 6, 9 and 12) and 50CdF₂⋅(20-x)BaF₂⋅xBaCl₂⋅30NaCl+0.1EuF₃ in molar ratio (x=0, 5, 10, 10, 15 and 20), respectively. Changes in the anion coordination around cations with the Cl substitution were examined by molecular dynamics simulation and Eu³⁺ fluorescence spectroscopy. The experimental results revealed that the chlorofluoroaluminate glasses satisfy the present research object, while the chlorofluorocadmate glasses exert no effect on controlling the anion-coordination environments around rare-earth ions.