Darstellung, Kristallstruktur und physikalische Eigenschaften von Oktasilbertrigermanat, Ag8Ge3O10 / Synthesis, Crystal Structure and Physical Properties o f Octasilver Trigermanate, Ag8Ge3O10)

Abstract

Ag8Ge3O10 was obtained from a mixture of the binary oxides by solid state reaction in the presence of a small amount of water which is acting as an accelerator. Conditions applied were T = 500 °C and p(O2) = 1,2 kbar. According to an X-ray crystal structure analysis the title compound contains four crystallographically independent trigermanate [Ge3O10]8− ions per unit cell (Pc, a = 12.1549(11), b = 10.7375(14), c = 18.5169(20) Å, β = 92.326(10)°, 13448 independent reflections, R1 = 6 ,1 %, wR2 = 13,0%, Z = 8). Thermal decomposition, as recorded by DTA and temperature dependent Guinier photographs, occurs at 520 °C. Ag8Ge3O10 is diamagnetic with a molar susceptibility of -330 ·10−6 cm3 mol−1.