Ti2Mn4Si5 crystallizes in the orthorhombic Ibam space group. Ti(1) is bonded in a 8-coordinate geometry to two equivalent Ti(1), two equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 7-coordinate geometry to one Si(1), two equivalent Si(3), and four equivalent Si(2) atoms. In the second Mn site, Mn(2) is bonded in a 7-coordinate geometry to one Si(2), two equivalent Si(3), and four equivalent Si(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(3) is bonded in a 10-coordinate geometry to four equivalent Mn(1), four equivalent Mn(2), and two equivalent Si(3) atoms. In the second Si site, Si(1) is bonded in a 7-coordinate geometry to two equivalent Ti(1), one Mn(1), and four equivalent Mn(2) atoms. In the third Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Ti(1), one Mn(2), and four equivalent Mn(1) atoms.
Ti2Mn4Si5 crystallizes in the orthorhombic Ibam space group. Ti(1) is bonded in a 8-coordinate geometry to two equivalent Ti(1), two equivalent Si(1), and four equivalent Si(2) atoms. Both Ti(1)-Ti(1) bond lengths are 2.42 Å. Both Ti(1)-Si(1) bond lengths are 2.54 Å. There are two shorter (2.55 Å) and two longer (2.57 Å) Ti(1)-Si(2) bond lengths. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 7-coordinate geometry to one Si(1), two equivalent Si(3), and four equivalent Si(2) atoms. The Mn(1)-Si(1) bond length is 2.51 Å. Both Mn(1)-Si(3) bond lengths are 2.98 Å. There are a spread of Mn(1)-Si(2) bond distances ranging from 2.45-2.66 Å. In the second Mn site, Mn(2) is bonded in a 7-coordinate geometry to one Si(2), two equivalent Si(3), and four equivalent Si(1) atoms. The Mn(2)-Si(2) bond length is 2.36 Å. Both Mn(2)-Si(3) bond lengths are 2.44 Å. There are a spread of Mn(2)-Si(1) bond distances ranging from 2.28-2.64 Å. There are three inequivalent Si sites. In the first Si site, Si(3) is bonded in a 10-coordinate geometry to four equivalent Mn(1), four equivalent Mn(2), and two equivalent Si(3) atoms. Both Si(3)-Si(3) bond lengths are 2.42 Å. In the second Si site, Si(1) is bonded in a 7-coordinate geometry to two equivalent Ti(1), one Mn(1), and four equivalent Mn(2) atoms. In the third Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Ti(1), one Mn(2), and four equivalent Mn(1) atoms.