SrEuPrNbO6 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms. Eu(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), two equivalent O(1), and two equivalent O(4) atoms. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form PrO6 octahedra that share corners with two equivalent Nb(2)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-36°. In the second Pr site, Pr(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form PrO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra and corners with four equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-35°. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form NbO6 octahedra that share corners with two equivalent Pr(2)O6 octahedra and corners with four equivalent Pr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-36°. In the second Nb site, Nb(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form NbO6 octahedra that share corners with two equivalent Pr(1)O6 octahedra and corners with four equivalent Pr(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-36°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Eu(1), one Pr(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Eu(1), one Pr(2), and one Nb(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Eu(1), one Pr(1), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Eu(1), one Pr(2), and one Nb(2) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Eu(1), one Pr(1), and one Nb(2) atom to form distorted corner-sharing OSrPrEuNb tetrahedra. In the sixth O site, O(6) is bonded to one Sr(1), one Eu(1), one Pr(2), and one Nb(1) atom to form distorted corner-sharing OSrPrEuNb tetrahedra.
SrEuPrNbO6 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms. The Sr(1)-O(1) bond length is 2.81 Å. The Sr(1)-O(4) bond length is 2.79 Å. The Sr(1)-O(5) bond length is 2.63 Å. The Sr(1)-O(6) bond length is 2.50 Å. There is one shorter (2.52 Å) and one longer (3.00 Å) Sr(1)-O(2) bond length. There is one shorter (2.51 Å) and one longer (3.04 Å) Sr(1)-O(3) bond length. Eu(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), two equivalent O(1), and two equivalent O(4) atoms. The Eu(1)-O(2) bond length is 2.79 Å. The Eu(1)-O(3) bond length is 2.77 Å. The Eu(1)-O(5) bond length is 2.46 Å. The Eu(1)-O(6) bond length is 2.57 Å. There is one shorter (2.50 Å) and one longer (2.99 Å) Eu(1)-O(1) bond length. There is one shorter (2.48 Å) and one longer (3.07 Å) Eu(1)-O(4) bond length. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form PrO6 octahedra that share corners with two equivalent Nb(2)O6 octahedra and corners with four equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-36°. Both Pr(1)-O(1) bond lengths are 2.39 Å. Both Pr(1)-O(3) bond lengths are 2.38 Å. Both Pr(1)-O(5) bond lengths are 2.40 Å. In the second Pr site, Pr(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms to form PrO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra and corners with four equivalent Nb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-35°. Both Pr(2)-O(2) bond lengths are 2.39 Å. Both Pr(2)-O(4) bond lengths are 2.39 Å. Both Pr(2)-O(6) bond lengths are 2.39 Å. There are two inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(6) atoms to form NbO6 octahedra that share corners with two equivalent Pr(2)O6 octahedra and corners with four equivalent Pr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-36°. Both Nb(1)-O(1) bond lengths are 2.06 Å. Both Nb(1)-O(3) bond lengths are 2.03 Å. Both Nb(1)-O(6) bond lengths are 2.04 Å. In the second Nb site, Nb(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms to form NbO6 octahedra that share corners with two equivalent Pr(1)O6 octahedra and corners with four equivalent Pr(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-36°. Both Nb(2)-O(2) bond lengths are 2.04 Å. Both Nb(2)-O(4) bond lengths are 2.04 Å. Both Nb(2)-O(5) bond lengths are 2.05 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Eu(1), one Pr(1), and one Nb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Eu(1), one Pr(2), and one Nb(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Sr(1), one Eu(1), one Pr(1), and one Nb(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Eu(1), one Pr(2), and one Nb(2) atom. In the fifth O site, O(5) is bonded to one Sr(1), one Eu(1), one Pr(1), and one Nb(2) atom to form distorted corner-sharing OSrPrEuNb tetrahedra. In the sixth O site, O(6) is bonded to one Sr(1), one Eu(1), one Pr(2), and one Nb(1) atom to form distorted corner-sharing OSrPrEuNb tetrahedra.