GdTiNbBi2O9 is Esseneite-derived structured and crystallizes in the monoclinic P2_1 space group. Gd(1) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(3), two equivalent O(8), and two equivalent O(9) atoms. Ti(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(8), and one O(9) atom to form distorted TiO6 octahedra that share corners with five equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-38°. Nb(1) is bonded to one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom to form distorted NbO6 octahedra that share corners with five equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-38°. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. There are nine inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of corner and edge-sharing OBi4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of corner and edge-sharing OBi4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Gd(1), one Ti(1), and one Nb(1) atom to form a mixture of distorted corner and edge-sharing OGd2TiNb tetrahedra. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Gd(1), one Ti(1), and one Nb(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Gd(1), one Ti(1), and one Nb(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ti(1), one Bi(1), and one Bi(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Nb(1), one Bi(1), and one Bi(2) atom. In the eighth O site, O(8) is bonded to two equivalent Gd(1), one Ti(1), and one Nb(1) atom to form a mixture of distorted corner and edge-sharing OGd2TiNb tetrahedra. In the ninth O site, O(9) is bonded to two equivalent Gd(1), one Ti(1), and one Nb(1) atom to form a mixture of distorted corner and edge-sharing OGd2TiNb trigonal pyramids.
GdTiNbBi2O9 is Esseneite-derived structured and crystallizes in the monoclinic P2_1 space group. Gd(1) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(3), two equivalent O(8), and two equivalent O(9) atoms. The Gd(1)-O(4) bond length is 2.56 Å. The Gd(1)-O(5) bond length is 2.55 Å. There is one shorter (2.31 Å) and one longer (2.33 Å) Gd(1)-O(3) bond length. There is one shorter (2.40 Å) and one longer (2.47 Å) Gd(1)-O(8) bond length. There is one shorter (2.40 Å) and one longer (2.48 Å) Gd(1)-O(9) bond length. Ti(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(8), and one O(9) atom to form distorted TiO6 octahedra that share corners with five equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-38°. The Ti(1)-O(3) bond length is 2.21 Å. The Ti(1)-O(4) bond length is 2.06 Å. The Ti(1)-O(5) bond length is 1.90 Å. The Ti(1)-O(6) bond length is 1.81 Å. The Ti(1)-O(8) bond length is 2.16 Å. The Ti(1)-O(9) bond length is 1.94 Å. Nb(1) is bonded to one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom to form distorted NbO6 octahedra that share corners with five equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-38°. The Nb(1)-O(3) bond length is 2.19 Å. The Nb(1)-O(4) bond length is 1.91 Å. The Nb(1)-O(5) bond length is 2.05 Å. The Nb(1)-O(7) bond length is 1.89 Å. The Nb(1)-O(8) bond length is 1.99 Å. The Nb(1)-O(9) bond length is 2.18 Å. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. The Bi(1)-O(6) bond length is 2.41 Å. The Bi(1)-O(7) bond length is 2.64 Å. There is one shorter (2.22 Å) and one longer (2.49 Å) Bi(1)-O(1) bond length. There is one shorter (2.28 Å) and one longer (2.35 Å) Bi(1)-O(2) bond length. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. The Bi(2)-O(6) bond length is 2.64 Å. The Bi(2)-O(7) bond length is 2.46 Å. Both Bi(2)-O(1) bond lengths are 2.31 Å. There is one shorter (2.21 Å) and one longer (2.48 Å) Bi(2)-O(2) bond length. There are nine inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of corner and edge-sharing OBi4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form a mixture of corner and edge-sharing OBi4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Gd(1), one Ti(1), and one Nb(1) atom to form a mixture of distorted corner and edge-sharing OGd2TiNb tetrahedra. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Gd(1), one Ti(1), and one Nb(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Gd(1), one Ti(1), and one Nb(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ti(1), one Bi(1), and one Bi(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Nb(1), one Bi(1), and one Bi(2) atom. In the eighth O site, O(8) is bonded to two equivalent Gd(1), one Ti(1), and one Nb(1) atom to form a mixture of distorted corner and edge-sharing OGd2TiNb tetrahedra. In the ninth O site, O(9) is bonded to two equivalent Gd(1), one Ti(1), and one Nb(1) atom to form a mixture of distorted corner and edge-sharing OGd2TiNb trigonal pyramids.