Design in Solid State Synthesis Based on Phase Homologies: A1-xSn9-xBi11+xSe26 (A=K, Rb, Cs)––A New Member of the Grand Homologous Series Am[M6Se8]m[M5+nSe9+n] with M=Sn and Bi

Both the composition and structure of A1-xSn9-xBi11+xSe26 (A=K, Rb, Cs) were predicted on the basis of the homologous series Am[M6Se8]m[M5+nSe9+n] (M=Sn, Bi) and targeted for synthesis. A1-xSn9-xBi11+xSe26 adopts a new structure type that fits the structural evolution of the homologous series.