Sr3Fe2TeO9 is (Cubic) Perovskite-derived structured and crystallizes in the trigonal P-3m1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with six equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Te(1)O6 octahedra, and faces with six equivalent Fe(1)O6 octahedra. In the second Sr site, Sr(2) is bonded to three equivalent O(1) and nine equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with nine equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Te(1)O6 octahedra, and faces with five equivalent Fe(1)O6 octahedra. Fe(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form FeO6 octahedra that share corners with three equivalent Fe(1)O6 octahedra, corners with three equivalent Te(1)O6 octahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with five equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. Te(1) is bonded to six equivalent O(2) atoms to form TeO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with six equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 3°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded to one Sr(1), three equivalent Sr(2), one Fe(1), and one Te(1) atom to form a mixture of distorted edge, face, and corner-sharing OSr4FeTe octahedra. The corner-sharing octahedral tilt angles range from 0-63°.
Sr3Fe2TeO9 is (Cubic) Perovskite-derived structured and crystallizes in the trigonal P-3m1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(1)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with six equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Te(1)O6 octahedra, and faces with six equivalent Fe(1)O6 octahedra. All Sr(1)-O(1) bond lengths are 2.82 Å. All Sr(1)-O(2) bond lengths are 2.84 Å. In the second Sr site, Sr(2) is bonded to three equivalent O(1) and nine equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with nine equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Te(1)O6 octahedra, and faces with five equivalent Fe(1)O6 octahedra. All Sr(2)-O(1) bond lengths are 2.76 Å. There are six shorter (2.83 Å) and three longer (2.89 Å) Sr(2)-O(2) bond lengths. Fe(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form FeO6 octahedra that share corners with three equivalent Fe(1)O6 octahedra, corners with three equivalent Te(1)O6 octahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with five equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. All Fe(1)-O(1) bond lengths are 1.94 Å. All Fe(1)-O(2) bond lengths are 2.12 Å. Te(1) is bonded to six equivalent O(2) atoms to form TeO6 octahedra that share corners with six equivalent Fe(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with six equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 3°. All Te(1)-O(2) bond lengths are 1.94 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded to one Sr(1), three equivalent Sr(2), one Fe(1), and one Te(1) atom to form a mixture of distorted edge, face, and corner-sharing OSr4FeTe octahedra. The corner-sharing octahedral tilt angles range from 0-63°.