On the crystal structure of a new binary oxide Sr3Te4O11

Single crystals of Sr3Te4O11 were grown from SrTeO3–TeO2 melts. Sr3Te4O11 crystallizes in the triclinic system, space group P1 (No. 1). The lattice parameters are a = 7.531(1), b = 9.240(1), c = 9.546(2) Å, α = 98.07(1)°, β = 109.55(1)°, γ = 102.19(1)°, Z = 2. The Sr3Te4O11 crystal structure has been solved by X-ray single-crystal techniques up to a final R-value 0.0455 and wR2-value 0.1245 (SHELXL-93 software package) using 2490 observed reflections. Sr3Te4O11 forms a three-dimensional lattice consisting of trigonal TeO3 pyramids, trigonal TeO4 bipyramids, and irregular polyhedra (with 7, 8, or 9 apices) of Sr.