Ag4Bi2O5 - A novel Silverbismuthate(III)

Yellow single crystals of Ag4Bi2O5 have been obtained for the first time by solid state reaction of Ag2O and Bi2O3 applying an oxygen pressure of 10 MPa at a temperature of 473 K. According to the results of a single crystal structure determination (Pnna, a = 1428.3(2), b = 569.2(1), c = 877.7(1)pm, Z = 4, 1544 diffractometer data, R(1) = 0.050, wR(2) = 0.094) the anionic partial structure of Ag4Bi2O5 consists of chains of corner and edge sharing BiO4-units. The silveratoms form a network of threedimensionally connected trigonal bipyramides with Ag-Ag-contacts between 285 and 323 pm.