Structural, electronic, and optical studies of BaRE2Ge3O10 (RE = Y, Sc, Gd–Lu) germanates with a special focus on the [Ge3O10]8− geometry

摘要: A new series of BaRE2Ge3O10 (RE = Y, Sc, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) trigermanates has been prepared using a solid-state reaction. Powder XRD study revealed that the compounds crystallize in monoclinic system, space group P21/m, Z 2. The crystal lattice consists edge-sharing REO6 octahedra, bowed trigermanate [Ge3O10]8− groups, and Ba atoms located eight-fold coordinated irregular sites. geometry anions persisting within different examined with special focus on values Ge–Ge–Ge angles types conformation between central terminal GeO4 tetrahedra. arrangement Gd–Lu) lattices is found to be unique. DFT calculations polymorphs for BaY2Ge3O10 BaLa2Ge3O10 have confirmed our fabrication protocol yields all products their most thermodynamically stable forms. According results vibrational spectroscopy studies, diffuse reflectance photoluminescence measurements, are promising preparation efficient lanthanide ion activated phosphors.