Nd2AgSi3 is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to two equivalent Ag(1), two equivalent Si(3), four equivalent Si(1), and four equivalent Si(2) atoms to form NdSi10Ag2 cuboctahedra that share edges with four equivalent Nd(1)Si10Ag2 cuboctahedra, edges with eight equivalent Nd(2)Si8Ag4 cuboctahedra, faces with four equivalent Nd(1)Si10Ag2 cuboctahedra, and faces with four equivalent Nd(2)Si8Ag4 cuboctahedra. In the second Nd site, Nd(2) is bonded to four equivalent Ag(1), two equivalent Si(1), two equivalent Si(2), and four equivalent Si(3) atoms to form NdSi8Ag4 cuboctahedra that share edges with four equivalent Nd(2)Si8Ag4 cuboctahedra, edges with eight equivalent Nd(1)Si10Ag2 cuboctahedra, faces with four equivalent Nd(1)Si10Ag2 cuboctahedra, and faces with four equivalent Nd(2)Si8Ag4 cuboctahedra. Ag(1) is bonded in a 9-coordinate geometry to two equivalent Nd(1), four equivalent Nd(2), one Si(3), and two equivalent Si(2) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Nd(2), four equivalent Nd(1), one Si(2), and two equivalent Si(3) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Nd(2), four equivalent Nd(1), two equivalent Ag(1), and one Si(1) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Nd(1), four equivalent Nd(2), one Ag(1), and two equivalent Si(1) atoms.
Nd2AgSi3 is hexagonal omega structure-derived structured and crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to two equivalent Ag(1), two equivalent Si(3), four equivalent Si(1), and four equivalent Si(2) atoms to form NdSi10Ag2 cuboctahedra that share edges with four equivalent Nd(1)Si10Ag2 cuboctahedra, edges with eight equivalent Nd(2)Si8Ag4 cuboctahedra, faces with four equivalent Nd(1)Si10Ag2 cuboctahedra, and faces with four equivalent Nd(2)Si8Ag4 cuboctahedra. Both Nd(1)-Ag(1) bond lengths are 3.21 Å. Both Nd(1)-Si(3) bond lengths are 3.15 Å. All Nd(1)-Si(1) bond lengths are 3.17 Å. All Nd(1)-Si(2) bond lengths are 3.25 Å. In the second Nd site, Nd(2) is bonded to four equivalent Ag(1), two equivalent Si(1), two equivalent Si(2), and four equivalent Si(3) atoms to form NdSi8Ag4 cuboctahedra that share edges with four equivalent Nd(2)Si8Ag4 cuboctahedra, edges with eight equivalent Nd(1)Si10Ag2 cuboctahedra, faces with four equivalent Nd(1)Si10Ag2 cuboctahedra, and faces with four equivalent Nd(2)Si8Ag4 cuboctahedra. All Nd(2)-Ag(1) bond lengths are 3.27 Å. Both Nd(2)-Si(1) bond lengths are 3.19 Å. Both Nd(2)-Si(2) bond lengths are 3.26 Å. All Nd(2)-Si(3) bond lengths are 3.18 Å. Ag(1) is bonded in a 9-coordinate geometry to two equivalent Nd(1), four equivalent Nd(2), one Si(3), and two equivalent Si(2) atoms. The Ag(1)-Si(3) bond length is 2.45 Å. Both Ag(1)-Si(2) bond lengths are 2.47 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Nd(2), four equivalent Nd(1), one Si(2), and two equivalent Si(3) atoms. The Si(1)-Si(2) bond length is 2.34 Å. Both Si(1)-Si(3) bond lengths are 2.39 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Nd(2), four equivalent Nd(1), two equivalent Ag(1), and one Si(1) atom. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Nd(1), four equivalent Nd(2), one Ag(1), and two equivalent Si(1) atoms.