M2Ga6Te10 (M: Li, Na): Two New Non-metallic Filled β-Manganese Phases - X-ray and NMR Studies

Synthesis, structure, and optical properties of K2.4Ga2.4M1.6Q8(M = Si, Ge; Q = S, Se) crystals and glasses

Four isostructural new inorganic polymers, K_2.4Ga_2.4M_1.6Q₈(M = Si, Ge; Q = S, Se), have been successfully synthesized.

Modified Bridgman growth and characterization of a novel mid-infrared transparent optical crystal: LiGa3Te5

A promising MIR NLO crystal LiGa₃Te₅ with large size (Ø16 mm × 50 mm) and wide transparency range (0.9–25 μm) was grown by modified Bridgman method.

Ag6GeS4X2 (X: Cl, Br): surprisingly no filled Laves phases but the first representatives of a new structure type

The two new deeply coloured, air stable, isotypic compounds Ag6GeS4X2 (X: Cl, Br) were obtained in the course of a series of experiments to prepare new “non-metallic filled Laves phases (= argyrodites)”. Although the chemical compositions of the new compounds are in accordance with the desired rare type of doubly halide (X) substituted argyrodites Ag6GeS4X2, their crystal structures are not of the argyrodite type. Instead they are the first members of the new family of “non-metallic filled NaHg2 phases”, i.e. the partial structure of the non-metal atoms S and X (Cl, Br) corresponds to the arrangement of Na and Hg atoms in NaHg2 (= X2S4) with Ge located in tetrahedral holes exclusively and Ag located in tetrahedral as well as octahedral holes. The lattice constants of the new phases are (both space group Pnma, Z = 4): Ag6GeS4Cl2 (a = 643.0(1) pm, b = 761.0(2) pm, c = 2266.0(5) pm), Ag6GeS4Br2 (a = 654.0(1) pm, b = 772.7(2) pm, c = 2289.9(5) pm). High temperature X-ray powder studies show an irreversible loss of halogen resulting in inhomogeneous decomposition products with argyrodite structure.