Synthesis and crystal structure of K3Sb4BO13

K3Sb4BO13, Mr = 823.11 g.mol(-1), crystallizes in the triclinic system, spa ce group P (1) over bar, Z = 2. The lattice parameters are a = 7.133(1) Ang strom, b = 7.232(1) Angstrom, c = 13.259(2) Angstrom, alpha = 82.00 (1)degr ees, beta = 99.77(1)degrees and gamma = 117.08(1)degrees, V = 598.7(2) Angs trom(3), D-x = 4.566 Mg m(-3). The final R index and weighted R-w index are 0.0251 and 0.0623, respectively. The three-dimensional network of the titl e compound is constituted by layers (Sb3O9)(n), similar to that of hexagona l bronze of Magneli. These layers are linked together, in the c direction, alternatively by edge-sharing pairs of SbO6 octahedra and BO3 triangles. Th is framework has interconnected tunnels, running approximately along the a and b directions, in which the K+ ions are located.