inorganic compounds
Tb2Ni2Mg3 is a new structure type, derived from Ru3Al2B2, which can be viewed as the first representative of a homologous linear structure series based on the -Fe, CsCl and AlB2 structure types. The Tb atoms in the structure are enclosed in 17-vertex polyhedra, while rhombododecahedra and distorted rhombododecahedra surround the Mg atoms, and equatorially tricapped trigonal prisms form around the Ni atoms.