EuTiNbBi2O9 crystallizes in the monoclinic P2_1 space group. Eu(1) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(3), two equivalent O(6), and two equivalent O(7) atoms. Ti(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted TiO6 octahedra that share corners with five equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-35°. Nb(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), 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 20-35°. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(8), one O(9), 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(8), one O(9), 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 in a 4-coordinate geometry to two equivalent Eu(1), one Ti(1), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Eu(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 Eu(1), one Ti(1), and one Nb(1) atom. In the sixth O site, O(6) is bonded to two equivalent Eu(1), one Ti(1), and one Nb(1) atom to form distorted corner-sharing OEu2TiNb trigonal pyramids. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Eu(1), one Ti(1), and one Nb(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Ti(1), one Bi(1), and one Bi(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Nb(1), one Bi(1), and one Bi(2) atom.
EuTiNbBi2O9 crystallizes in the monoclinic P2_1 space group. Eu(1) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(3), two equivalent O(6), and two equivalent O(7) atoms. The Eu(1)-O(4) bond length is 2.56 Å. The Eu(1)-O(5) bond length is 2.54 Å. There is one shorter (2.42 Å) and one longer (2.44 Å) Eu(1)-O(3) bond length. There is one shorter (2.46 Å) and one longer (2.60 Å) Eu(1)-O(6) bond length. There is one shorter (2.46 Å) and one longer (2.62 Å) Eu(1)-O(7) bond length. Ti(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted TiO6 octahedra that share corners with five equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-35°. The Ti(1)-O(3) bond length is 2.26 Å. The Ti(1)-O(4) bond length is 2.05 Å. The Ti(1)-O(5) bond length is 1.92 Å. The Ti(1)-O(6) bond length is 2.09 Å. The Ti(1)-O(7) bond length is 1.93 Å. The Ti(1)-O(8) bond length is 1.81 Å. Nb(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), 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 20-35°. The Nb(1)-O(3) bond length is 2.21 Å. The Nb(1)-O(4) bond length is 1.93 Å. The Nb(1)-O(5) bond length is 2.05 Å. The Nb(1)-O(6) bond length is 1.99 Å. The Nb(1)-O(7) bond length is 2.12 Å. The Nb(1)-O(9) bond length is 1.89 Å. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(8), one O(9), two equivalent O(1), and two equivalent O(2) atoms. The Bi(1)-O(8) bond length is 2.42 Å. The Bi(1)-O(9) bond length is 2.79 Å. There is one shorter (2.25 Å) and one longer (2.46 Å) Bi(1)-O(1) bond length. There is one shorter (2.27 Å) and one longer (2.37 Å) Bi(1)-O(2) bond length. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(8), one O(9), two equivalent O(1), and two equivalent O(2) atoms. The Bi(2)-O(8) bond length is 2.81 Å. The Bi(2)-O(9) bond length is 2.49 Å. There is one shorter (2.28 Å) and one longer (2.33 Å) Bi(2)-O(1) bond length. There is one shorter (2.25 Å) and one longer (2.44 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 in a 4-coordinate geometry to two equivalent Eu(1), one Ti(1), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Eu(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 Eu(1), one Ti(1), and one Nb(1) atom. In the sixth O site, O(6) is bonded to two equivalent Eu(1), one Ti(1), and one Nb(1) atom to form distorted corner-sharing OEu2TiNb trigonal pyramids. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Eu(1), one Ti(1), and one Nb(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Ti(1), one Bi(1), and one Bi(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Nb(1), one Bi(1), and one Bi(2) atom.