SmMnSi is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Sm(1) is bonded in a 9-coordinate geometry to four equivalent Mn(1) and five equivalent Si(1) atoms. Mn(1) is bonded to four equivalent Sm(1) and four equivalent Si(1) atoms to form a mixture of distorted face and edge-sharing MnSm4Si4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to five equivalent Sm(1) and four equivalent Mn(1) atoms.
SmMnSi is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. Sm(1) is bonded in a 9-coordinate geometry to four equivalent Mn(1) and five equivalent Si(1) atoms. All Sm(1)-Mn(1) bond lengths are 3.12 Å. There are four shorter (2.98 Å) and one longer (3.53 Å) Sm(1)-Si(1) bond length. Mn(1) is bonded to four equivalent Sm(1) and four equivalent Si(1) atoms to form a mixture of distorted face and edge-sharing MnSm4Si4 tetrahedra. All Mn(1)-Si(1) bond lengths are 2.43 Å. Si(1) is bonded in a 9-coordinate geometry to five equivalent Sm(1) and four equivalent Mn(1) atoms.