Ein Aufbaumodell für „Chimney-Ladder“-Strukturen

摘要

On the basis of a concept of inhomogeneous linear structure series a model for the “Chimney-Ladder”Nowotnyphases is proposed. All the phases can be explained as members of a structural series of general formulaTp+2q+3rB2p+2q+4r,T-transition metal of 5–7 groups,B-Al, Ga, Si, Ge, Sn. The real and possible hypothetical members of this series are described by the symmetry of 21 monoclinic, orthorhombic and tetragonal space groups. The structure types for Tc4Si7and Mo9Ge16have been pro