Über Ag2SnO3, das erste Silberstannat

On Ag₂SnO₃, the First Silver Stannate For the first time, crystals of red Ag₂SnO₃ have been obtained by solid state reaction of freshly prepared K₂Sn(OH)₆ and Ag₂O at 430°C while applying an oxygen pressure of 350 bar. Ag₂SnO₃ shows a one dimensional incommensurate superstructure with a′ = 33.1 Å. Here we report on the basic structure of Ag₂SnO₃. According to the results of X-ray crystal structure determination the basic structure of Ag₂SnO₃ may be described in P6₃22 (a = 5.6230(4) Å, c = 12.6694(14) Å, Z = 4, 968 independent reflections, R1 = 5.6%, wR2 = 12.5%). Within the layered “SnO₃” partial structure two third of the octahedral voids are occupied by tin. Those SnO₃ layers are connected to each other by almost linearly coordinated silver atoms. Additionally, silver occupies the free octahedral voids within the SnO₃ sheets. As expressed by the formula Ag[Ag_1/3Sn_2/3]O₂ the structure may be described as a super structure of Delafossite CuFeO₂.