Neue Verbindungen mit Zr2Fe12P7-Struktur und Verfeinergung der Kristallstrukturen von Er2Co12P7 und Er2Ni12P7

New Compounds Zr₂Fe₁₂P₇-Type Structure and Refinement of the Crystal Structures of Er₂Co₁₂P₇ and Er₂Ni₁₂P₇ The compounds Y₂Ni₁₂P₇ and Ln₂Ni₁₂P₇ (Ln = Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Lu) were prepared for the first time and characterized by their lattice constants. Their crystal structure corresponds to that of Zr₂Fe₁₂P₇. The structure of Er₂Co₁₂O₇ and Er₂Ni₁₂P₇ were refined from single-crystal counter data. Chemical bonding and the question of the proper space group for those and the closely related compounds V₁₂P₇ and Cr₁₂P₇ are discussed.