Tb(Fe2Si)2 crystallizes in the tetragonal P4_2/mnm space group. Tb(1) is bonded in a 18-coordinate geometry to twelve equivalent Fe(1) and six equivalent Si(1) atoms. Fe(1) is bonded in a 12-coordinate geometry to three equivalent Tb(1), six equivalent Fe(1), and three equivalent Si(1) atoms. Si(1) is bonded in a 9-coordinate geometry to three equivalent Tb(1) and six equivalent Fe(1) atoms.
Tb(Fe2Si)2 crystallizes in the tetragonal P4_2/mnm space group. Tb(1) is bonded in a 18-coordinate geometry to twelve equivalent Fe(1) and six equivalent Si(1) atoms. There are four shorter (3.11 Å) and eight longer (3.18 Å) Tb(1)-Fe(1) bond lengths. There are two shorter (2.83 Å) and four longer (2.89 Å) Tb(1)-Si(1) bond lengths. Fe(1) is bonded in a 12-coordinate geometry to three equivalent Tb(1), six equivalent Fe(1), and three equivalent Si(1) atoms. There are a spread of Fe(1)-Fe(1) bond distances ranging from 2.48-2.62 Å. There is one shorter (2.37 Å) and two longer (2.38 Å) Fe(1)-Si(1) bond lengths. Si(1) is bonded in a 9-coordinate geometry to three equivalent Tb(1) and six equivalent Fe(1) atoms.