Sr3Nd2Nb10O30 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(17), two equivalent O(10), and four equivalent O(14) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(1), one O(16), one O(2), two equivalent O(12), two equivalent O(13), and two equivalent O(9) atoms. Nd(1) is bonded to one O(1), one O(2), one O(3), one O(4), two equivalent O(5), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms to form NdO12 cuboctahedra that share faces with two equivalent Nd(1)O12 cuboctahedra, faces with two equivalent Nb(1)O6 octahedra, faces with two equivalent Nb(2)O6 octahedra, faces with two equivalent Nb(3)O6 octahedra, and faces with two equivalent Nb(4)O6 octahedra. There are six inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(14), one O(5), one O(7), one O(9), and two equivalent O(1) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Nb(3)O6 octahedra,  a cornercorner with one Nb(4)O6 octahedra,  a cornercorner with one Nb(6)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, and faces with two equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 13-49°. In the second Nb site, Nb(2) is bonded to one O(15), one O(6), one O(8), one O(9), and two equivalent O(2) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(3)O6 octahedra,  a cornercorner with one Nb(4)O6 octahedra,  a cornercorner with one Nb(6)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, and faces with two equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 8-49°. In the third Nb site, Nb(3) is bonded to one O(10), one O(12), one O(6), one O(7), and two equivalent O(3) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Nb(5)O6 octahedra, corners with three equivalent Nb(3)O6 octahedra, and faces with two equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 7-47°. In the fourth Nb site, Nb(4) is bonded to one O(11), one O(13), one O(5), one O(8), and two equivalent O(4) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Nb(5)O6 octahedra, corners with three equivalent Nb(4)O6 octahedra, and faces with two equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 12-41°. In the fifth Nb site, Nb(5) is bonded to two equivalent O(12), two equivalent O(13), and two equivalent O(16) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 1-41°. In the sixth Nb site, Nb(6) is bonded to two equivalent O(14), two equivalent O(15), and two equivalent O(17) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 17-45°. There are seventeen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sr(2), one Nd(1), and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sr(2), one Nd(1), and two equivalent Nb(2) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to one Nd(1) and two equivalent Nb(3) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Nd(1) and two equivalent Nb(4) atoms. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Nd(1), one Nb(1), and one Nb(4) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to two equivalent Nd(1), one Nb(2), and one Nb(3) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Nd(1), one Nb(1), and one Nb(3) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Nd(1), one Nb(2), and one Nb(4) atom. In the ninth O site, O(9) is bonded to two equivalent Sr(2), one Nb(1), and one Nb(2) atom to form distorted corner-sharing OSr2Nb2 tetrahedra. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Nb(3) atoms. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to two equivalent Nb(4) atoms. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(2), one Nb(3), and one Nb(5) atom. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(2), one Nb(4), and one Nb(5) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1), one Nb(1), and one Nb(6) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one Nb(2) and one Nb(6) atom. In the sixteenth O site, O(16) is bonded in a linear geometry to two equivalent Sr(2) and two equivalent Nb(5) atoms. In the seventeenth O site, O(17) is bonded in a distorted T-shaped geometry to one Sr(1) and two equivalent Nb(6) atoms.
Sr3Nd2Nb10O30 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(17), two equivalent O(10), and four equivalent O(14) atoms. The Sr(1)-O(17) bond length is 2.63 Å. Both Sr(1)-O(10) bond lengths are 2.81 Å. All Sr(1)-O(14) bond lengths are 2.70 Å. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(1), one O(16), one O(2), two equivalent O(12), two equivalent O(13), and two equivalent O(9) atoms. The Sr(2)-O(1) bond length is 3.19 Å. The Sr(2)-O(16) bond length is 2.97 Å. The Sr(2)-O(2) bond length is 3.22 Å. Both Sr(2)-O(12) bond lengths are 2.83 Å. Both Sr(2)-O(13) bond lengths are 2.77 Å. Both Sr(2)-O(9) bond lengths are 2.72 Å. Nd(1) is bonded to one O(1), one O(2), one O(3), one O(4), two equivalent O(5), two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms to form NdO12 cuboctahedra that share faces with two equivalent Nd(1)O12 cuboctahedra, faces with two equivalent Nb(1)O6 octahedra, faces with two equivalent Nb(2)O6 octahedra, faces with two equivalent Nb(3)O6 octahedra, and faces with two equivalent Nb(4)O6 octahedra. The Nd(1)-O(1) bond length is 2.69 Å. The Nd(1)-O(2) bond length is 2.67 Å. The Nd(1)-O(3) bond length is 2.80 Å. The Nd(1)-O(4) bond length is 2.55 Å. Both Nd(1)-O(5) bond lengths are 2.65 Å. Both Nd(1)-O(6) bond lengths are 2.76 Å. Both Nd(1)-O(7) bond lengths are 2.71 Å. Both Nd(1)-O(8) bond lengths are 2.67 Å. There are six inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one O(14), one O(5), one O(7), one O(9), and two equivalent O(1) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Nb(3)O6 octahedra,  a cornercorner with one Nb(4)O6 octahedra,  a cornercorner with one Nb(6)O6 octahedra, corners with two equivalent Nb(1)O6 octahedra, and faces with two equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 13-49°. The Nb(1)-O(14) bond length is 1.94 Å. The Nb(1)-O(5) bond length is 2.03 Å. The Nb(1)-O(7) bond length is 2.08 Å. The Nb(1)-O(9) bond length is 2.03 Å. Both Nb(1)-O(1) bond lengths are 2.00 Å. In the second Nb site, Nb(2) is bonded to one O(15), one O(6), one O(8), one O(9), and two equivalent O(2) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(3)O6 octahedra,  a cornercorner with one Nb(4)O6 octahedra,  a cornercorner with one Nb(6)O6 octahedra, corners with two equivalent Nb(2)O6 octahedra, and faces with two equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 8-49°. The Nb(2)-O(15) bond length is 1.95 Å. The Nb(2)-O(6) bond length is 2.02 Å. The Nb(2)-O(8) bond length is 2.02 Å. The Nb(2)-O(9) bond length is 2.07 Å. Both Nb(2)-O(2) bond lengths are 2.00 Å. In the third Nb site, Nb(3) is bonded to one O(10), one O(12), one O(6), one O(7), and two equivalent O(3) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Nb(5)O6 octahedra, corners with three equivalent Nb(3)O6 octahedra, and faces with two equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 7-47°. The Nb(3)-O(10) bond length is 2.03 Å. The Nb(3)-O(12) bond length is 2.00 Å. The Nb(3)-O(6) bond length is 2.03 Å. The Nb(3)-O(7) bond length is 2.01 Å. Both Nb(3)-O(3) bond lengths are 2.00 Å. In the fourth Nb site, Nb(4) is bonded to one O(11), one O(13), one O(5), one O(8), and two equivalent O(4) atoms to form NbO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra,  a cornercorner with one Nb(2)O6 octahedra,  a cornercorner with one Nb(5)O6 octahedra, corners with three equivalent Nb(4)O6 octahedra, and faces with two equivalent Nd(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 12-41°. The Nb(4)-O(11) bond length is 1.94 Å. The Nb(4)-O(13) bond length is 2.00 Å. The Nb(4)-O(5) bond length is 2.10 Å. The Nb(4)-O(8) bond length is 2.02 Å. Both Nb(4)-O(4) bond lengths are 2.01 Å. In the fifth Nb site, Nb(5) is bonded to two equivalent O(12), two equivalent O(13), and two equivalent O(16) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 1-41°. Both Nb(5)-O(12) bond lengths are 2.02 Å. Both Nb(5)-O(13) bond lengths are 2.04 Å. Both Nb(5)-O(16) bond lengths are 1.99 Å. In the sixth Nb site, Nb(6) is bonded to two equivalent O(14), two equivalent O(15), and two equivalent O(17) atoms to form corner-sharing NbO6 octahedra. The corner-sharing octahedral tilt angles range from 17-45°. Both Nb(6)-O(14) bond lengths are 2.16 Å. Both Nb(6)-O(15) bond lengths are 1.91 Å. Both Nb(6)-O(17) bond lengths are 2.01 Å. There are seventeen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sr(2), one Nd(1), and two equivalent Nb(1) atoms. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sr(2), one Nd(1), and two equivalent Nb(2) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to one Nd(1) and two equivalent Nb(3) atoms. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Nd(1) and two equivalent Nb(4) atoms. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Nd(1), one Nb(1), and one Nb(4) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to two equivalent Nd(1), one Nb(2), and one Nb(3) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Nd(1), one Nb(1), and one Nb(3) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Nd(1), one Nb(2), and one Nb(4) atom. In the ninth O site, O(9) is bonded to two equivalent Sr(2), one Nb(1), and one Nb(2) atom to form distorted corner-sharing OSr2Nb2 tetrahedra. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Nb(3) atoms. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to two equivalent Nb(4) atoms. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(2), one Nb(3), and one Nb(5) atom. In the thirteenth O site, O(13) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(2), one Nb(4), and one Nb(5) atom. In the fourteenth O site, O(14) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1), one Nb(1), and one Nb(6) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one Nb(2) and one Nb(6) atom. In the sixteenth O site, O(16) is bonded in a linear geometry to two equivalent Sr(2) and two equivalent Nb(5) atoms. In the seventeenth O site, O(17) is bonded in a distorted T-shaped geometry to one Sr(1) and two equivalent Nb(6) atoms.