LaY3(MnSi)4 crystallizes in the tetragonal P4mm space group. La(1) is bonded in a 13-coordinate geometry to four equivalent Y(2), four equivalent Mn(1), one Si(1), and four equivalent Si(3) atoms. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded in a 9-coordinate geometry to four equivalent Mn(2), one Si(2), and four equivalent Si(4) atoms. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to four equivalent La(1), four equivalent Mn(2), and four equivalent Si(1) atoms. In the third Y site, Y(3) is bonded in a 9-coordinate geometry to four equivalent Mn(1), one Si(4), and four equivalent Si(2) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent La(1), two equivalent Y(3), two equivalent Si(2), and two equivalent Si(3) atoms to form a mixture of distorted face and edge-sharing MnLa2Y2Si4 tetrahedra. In the second Mn site, Mn(2) is bonded to two equivalent Y(1), two equivalent Y(2), two equivalent Si(1), and two equivalent Si(4) atoms to form a mixture of distorted face and edge-sharing MnY4Si4 tetrahedra. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one La(1), four equivalent Y(2), and four equivalent Mn(2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to one Y(1), four equivalent Y(3), and four equivalent Mn(1) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent Mn(1) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to one Y(3), four equivalent Y(1), and four equivalent Mn(2) atoms.
LaY3(MnSi)4 crystallizes in the tetragonal P4mm space group. La(1) is bonded in a 13-coordinate geometry to four equivalent Y(2), four equivalent Mn(1), one Si(1), and four equivalent Si(3) atoms. All La(1)-Y(2) bond lengths are 3.84 Å. All La(1)-Mn(1) bond lengths are 3.24 Å. The La(1)-Si(1) bond length is 3.51 Å. All La(1)-Si(3) bond lengths are 3.04 Å. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded in a 9-coordinate geometry to four equivalent Mn(2), one Si(2), and four equivalent Si(4) atoms. All Y(1)-Mn(2) bond lengths are 3.07 Å. The Y(1)-Si(2) bond length is 3.35 Å. All Y(1)-Si(4) bond lengths are 2.94 Å. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to four equivalent La(1), four equivalent Mn(2), and four equivalent Si(1) atoms. All Y(2)-Mn(2) bond lengths are 3.03 Å. All Y(2)-Si(1) bond lengths are 2.94 Å. In the third Y site, Y(3) is bonded in a 9-coordinate geometry to four equivalent Mn(1), one Si(4), and four equivalent Si(2) atoms. All Y(3)-Mn(1) bond lengths are 3.05 Å. The Y(3)-Si(4) bond length is 3.36 Å. All Y(3)-Si(2) bond lengths are 2.94 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent La(1), two equivalent Y(3), two equivalent Si(2), and two equivalent Si(3) atoms to form a mixture of distorted face and edge-sharing MnLa2Y2Si4 tetrahedra. Both Mn(1)-Si(2) bond lengths are 2.44 Å. Both Mn(1)-Si(3) bond lengths are 2.41 Å. In the second Mn site, Mn(2) is bonded to two equivalent Y(1), two equivalent Y(2), two equivalent Si(1), and two equivalent Si(4) atoms to form a mixture of distorted face and edge-sharing MnY4Si4 tetrahedra. Both Mn(2)-Si(1) bond lengths are 2.43 Å. Both Mn(2)-Si(4) bond lengths are 2.44 Å. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one La(1), four equivalent Y(2), and four equivalent Mn(2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to one Y(1), four equivalent Y(3), and four equivalent Mn(1) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent Mn(1) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to one Y(3), four equivalent Y(1), and four equivalent Mn(2) atoms.