Yb_8Ge_3Sb_5, a Metallic Mixed-Valent Zintl Phase Containing the Polymeric 1_∞[Ge_3~(4-)] Anions

摘要

The structural diversity of main group cluster and oligomeric anions found in Zintl phases is astonishing. Homoatomic anions of group 14 metalloids such as Ge are particularly diverse in the geometries they adopt to satisfy their octet. These include clusters such as the trigonal bipyramidal Ge_5~(2-,2) the distorted tricapped trigonal prismatic Ge_9~(2-,3) the distorted bicapped square antiprismatic Ge_(10)~(2-,4) the octahedral Ge_6~(4-,5) the tetrahedral Ge_4~(4-,6) and the Ge_4~(4-) butterfly ion, to name a few. Many of these species were originally discovered as isolated fragments, but in several cases polymerization into extended structures has been observed.