New silicate-germanate Cs2Pb2[(Si0.6Ge0.4)2O7] from the series A2Pb2[B2O7], AÂ = K, Cs, BÂ = Si, Ge with the umbrella-like [PbO3]4- group
Keywords: Silicate-germanate Cs2Pb2[(Si0.6Ge0.4)2O7]; Hydrothermal synthesis; Single crystal structure; Umbrella-like [PbO3]4- group; Structural relations;