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DOE OSTI2020

Materials Data on Sr3La4O9 by Materials Project

La4Sr3O9 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are six inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded to five O2- atoms to form distorted SrO5 trigonal bipyramids that share a cornercorner with one LaO5 square pyramid and an edgeedge with one LaO5 trigonal bipyramid. There are a spread of Sr–O bond distances ranging from 2.40–2.65 Å. In the second Sr2+ site, Sr2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Sr–O bond distances ranging from 2.50–2.87 Å. In the third Sr2+ site, Sr2+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Sr–O bond distances ranging from 2.42–2.57 Å. In the fourth Sr2+ site, Sr2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Sr–O bond distances ranging from 2.42–3.09 Å. In the fifth Sr2+ site, Sr2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Sr–O bond distances ranging from 2.46–2.94 Å. In the sixth Sr2+ site, Sr2+ is bonded to five O2- atoms to form distorted SrO5 trigonal bipyramids that share a cornercorner with one LaO5 square pyramid, corners with two LaO5 trigonal bipyramids, and an edgeedge with one LaO5 trigonal bipyramid. There are a spread of Sr–O bond distances ranging from 2.36–2.81 Å. There are eight inequivalent La3+ sites. In the first La3+ site, La3+ is bonded to five O2- atoms to form distorted LaO5 trigonal bipyramids that share a cornercorner with one LaO5 square pyramid, an edgeedge with one SrO5 trigonal bipyramid, and an edgeedge with one LaO5 trigonal bipyramid. There are a spread of La–O bond distances ranging from 2.34–2.52 Å. In the second La3+ site, La3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of La–O bond distances ranging from 2.29–2.88 Å. In the third La3+ site, La3+ is bonded to five O2- atoms to form distorted LaO5 trigonal bipyramids that share a cornercorner with one SrO5 trigonal bipyramid, a cornercorner with one LaO5 trigonal bipyramid, and an edgeedge with one LaO5 trigonal bipyramid. There are a spread of La–O bond distances ranging from 2.20–2.64 Å. In the fourth La3+ site, La3+ is bonded to five O2- atoms to form distorted LaO5 trigonal bipyramids that share a cornercorner with one SrO5 trigonal bipyramid, a cornercorner with one LaO5 trigonal bipyramid, an edgeedge with one LaO5 square pyramid, and an edgeedge with one SrO5 trigonal bipyramid. There are a spread of La–O bond distances ranging from 2.24–2.45 Å. In the fifth La3+ site, La3+ is bonded in a 4-coordinate geometry to five O2- atoms. There are a spread of La–O bond distances ranging from 2.21–3.05 Å. In the sixth La3+ site, La3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of La–O bond distances ranging from 2.32–2.81 Å. In the seventh La3+ site, La3+ is bonded to five O2- atoms to form distorted LaO5 square pyramids that share a cornercorner with one LaO5 trigonal bipyramid, corners with two SrO5 trigonal bipyramids, and an edgeedge with one LaO5 trigonal bipyramid. There are a spread of La–O bond distances ranging from 2.26–2.65 Å. In the eighth La3+ site, La3+ is bonded in a distorted see-saw-like geometry to four O2- atoms. There are a spread of La–O bond distances ranging from 2.23–2.38 Å. There are eighteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted see-saw-like geometry to three Sr2+ and one La3+ atom. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Sr2+ and two La3+ atoms. In the third O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Sr2+ and two La3+ atoms. In the fourth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form distorted OSr2La2 tetrahedra that share corners with four OSrLa3 tetrahedra, a cornercorner with one OSr2La2 trigonal pyramid, an edgeedge with one OSr2La2 tetrahedra, and an edgeedge with one OSrLa3 trigonal pyramid. In the fifth O2- site, O2- is bonded to one Sr2+ and three La3+ atoms to form distorted OSrLa3 trigonal pyramids that share corners with three OSr2La2 tetrahedra, edges with two OSr2La2 tetrahedra, and an edgeedge with one OSr2La3 trigonal bipyramid. In the sixth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two Sr2+ and two La3+ atoms. In the seventh O2- site, O2- is bonded to three Sr2+ and two La3+ atoms to form distorted OSr3La2 trigonal bipyramids that share corners with three OSrLa3 tetrahedra, an edgeedge with one OSr2La2 tetrahedra, an edgeedge with one OSr2La3 trigonal bipyramid, and an edgeedge with one OSr2La2 trigonal pyramid. In the eighth O2- site, O2- is bonded in a distorted see-saw-like geometry to two Sr2+ and two La3+ atoms. In the ninth O2- site, O2- is bonded in a 5-coordinate geometry to one Sr2+ and four La3+ atoms. In the tenth O2- site, O2- is bonded to one Sr2+ and three La3+ atoms to form distorted OSrLa3 tetrahedra that share a cornercorner with one OSr2La2 tetrahedra, corners with two OSr3La2 trigonal bipyramids, a cornercorner with one OSr2La2 trigonal pyramid, an edgeedge with one OSr2La2 tetrahedra, an edgeedge with one OSr2La3 trigonal bipyramid, and an edgeedge with one OSrLa3 trigonal pyramid. In the eleventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two La3+ atoms. In the twelfth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form distorted OSr2La2 trigonal pyramids that share corners with four OSr2La2 tetrahedra and edges with two OSr3La2 trigonal bipyramids. In the thirteenth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form distorted OSr2La2 tetrahedra that share a cornercorner with one OSr3La2 trigonal bipyramid, a cornercorner with one OSrLa3 trigonal pyramid, and edges with three OSr2La2 tetrahedra. In the fourteenth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form distorted OSr2La2 tetrahedra that share corners with two equivalent OSr2La2 tetrahedra, a cornercorner with one OSr2La3 trigonal bipyramid, corners with three OSrLa3 trigonal pyramids, and edges with two OSr2La2 tetrahedra. In the fifteenth O2- site, O2- is bonded in a 5-coordinate geometry to two Sr2+ and three La3+ atoms. In the sixteenth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form distorted OSr2La2 tetrahedra that share a cornercorner with one OSr2La2 tetrahedra, corners with two OSr3La2 trigonal bipyramids, a cornercorner with one OSr2La2 trigonal pyramid, an edgeedge with one OSr2La2 tetrahedra, and an edgeedge with one OSr3La2 trigonal bipyramid. In the seventeenth O2- site, O2- is bonded to two Sr2+ and three La3+ atoms to form distorted OSr2La3 trigonal bipyramids that share corners with three OSrLa3 tetrahedra, an edgeedge with one OSrLa3 tetrahedra, an edgeedge with one OSr3La2 trigonal bipyramid, and edges with two OSrLa3 trigonal pyramids. In the eighteenth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Sr2+ and two La3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr3La4O9 by Materials Project

La4Sr3O9 is Orthorhombic Perovskite-like structured and crystallizes in the trigonal R3 space group. The structure is three-dimensional. there are three inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (2.51 Å) and three longer (2.83 Å) Sr–O bond lengths. In the second Sr2+ site, Sr2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (2.49 Å) and three longer (2.86 Å) Sr–O bond lengths. In the third Sr2+ site, Sr2+ is bonded in a 3-coordinate geometry to six O2- atoms. There are three shorter (2.44 Å) and three longer (3.06 Å) Sr–O bond lengths. There are four inequivalent La3+ sites. In the first La3+ site, La3+ is bonded to six O2- atoms to form corner-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles are 36°. There are three shorter (2.37 Å) and three longer (2.51 Å) La–O bond lengths. In the second La3+ site, La3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are three shorter (2.34 Å) and three longer (2.60 Å) La–O bond lengths. In the third La3+ site, La3+ is bonded to six O2- atoms to form corner-sharing LaO6 octahedra. The corner-sharing octahedral tilt angles are 36°. There are three shorter (2.40 Å) and three longer (2.42 Å) La–O bond lengths. In the fourth La3+ site, La3+ is bonded in a 3-coordinate geometry to six O2- atoms. There are three shorter (2.31 Å) and three longer (2.81 Å) La–O bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to three Sr2+ and two La3+ atoms to form a mixture of distorted corner and edge-sharing OSr3La2 trigonal bipyramids. In the second O2- site, O2- is bonded in a 5-coordinate geometry to two Sr2+ and three La3+ atoms. In the third O2- site, O2- is bonded in a distorted see-saw-like geometry to one Sr2+ and three La3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr3La4O9 by Materials Project

La4Sr3O9 crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are three inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Sr–O bond distances ranging from 2.52–2.80 Å. In the second Sr2+ site, Sr2+ is bonded to seven O2- atoms to form distorted SrO7 pentagonal bipyramids that share a cornercorner with one LaO7 pentagonal bipyramid, corners with three equivalent SrO7 pentagonal bipyramids, corners with three LaO6 pentagonal pyramids, an edgeedge with one SrO7 pentagonal bipyramid, edges with two equivalent LaO7 pentagonal bipyramids, and edges with five LaO6 pentagonal pyramids. There are a spread of Sr–O bond distances ranging from 2.48–2.79 Å. In the third Sr2+ site, Sr2+ is bonded to seven O2- atoms to form distorted SrO7 pentagonal bipyramids that share a cornercorner with one LaO7 pentagonal bipyramid, corners with three equivalent SrO7 pentagonal bipyramids, corners with three LaO6 pentagonal pyramids, an edgeedge with one SrO7 pentagonal bipyramid, an edgeedge with one LaO7 pentagonal bipyramid, edges with five LaO6 pentagonal pyramids, and a faceface with one LaO7 pentagonal bipyramid. There are a spread of Sr–O bond distances ranging from 2.52–2.86 Å. There are four inequivalent La3+ sites. In the first La3+ site, La3+ is bonded to six O2- atoms to form distorted LaO6 pentagonal pyramids that share corners with two equivalent LaO7 pentagonal bipyramids, corners with three SrO7 pentagonal bipyramids, a cornercorner with one LaO6 pentagonal pyramid, an edgeedge with one LaO7 pentagonal bipyramid, edges with three SrO7 pentagonal bipyramids, and edges with four LaO6 pentagonal pyramids. There are a spread of La–O bond distances ranging from 2.33–2.59 Å. In the second La3+ site, La3+ is bonded to seven O2- atoms to form distorted LaO7 pentagonal bipyramids that share corners with two SrO7 pentagonal bipyramids, corners with four LaO6 pentagonal pyramids, edges with three SrO7 pentagonal bipyramids, edges with four LaO6 pentagonal pyramids, and a faceface with one SrO7 pentagonal bipyramid. There are a spread of La–O bond distances ranging from 2.32–2.78 Å. In the third La3+ site, La3+ is bonded to six O2- atoms to form distorted LaO6 pentagonal pyramids that share corners with three SrO7 pentagonal bipyramids, a cornercorner with one LaO6 pentagonal pyramid, edges with two equivalent LaO7 pentagonal bipyramids, edges with three SrO7 pentagonal bipyramids, and edges with four LaO6 pentagonal pyramids. There are a spread of La–O bond distances ranging from 2.32–2.58 Å. In the fourth La3+ site, La3+ is bonded to six O2- atoms to form distorted LaO6 pentagonal pyramids that share corners with two equivalent LaO7 pentagonal bipyramids, corners with two LaO6 pentagonal pyramids, an edgeedge with one LaO7 pentagonal bipyramid, edges with four SrO7 pentagonal bipyramids, and edges with four LaO6 pentagonal pyramids. There are a spread of La–O bond distances ranging from 2.37–2.52 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded to three Sr2+ and three La3+ atoms to form OSr3La3 octahedra that share corners with two equivalent OSr2La4 octahedra, corners with twelve OSr2La3 trigonal bipyramids, a cornercorner with one OSr3La trigonal pyramid, edges with five OSr3La2 trigonal bipyramids, an edgeedge with one OSr3La trigonal pyramid, a faceface with one OSr2La4 octahedra, and a faceface with one OSr2La3 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 33–35°. In the second O2- site, O2- is bonded to two Sr2+ and four La3+ atoms to form OSr2La4 octahedra that share corners with two equivalent OSr3La3 octahedra, corners with twelve OSr2La3 trigonal bipyramids, a cornercorner with one OSr3La trigonal pyramid, edges with five OSr2La3 trigonal bipyramids, an edgeedge with one OSr3La trigonal pyramid, a faceface with one OSr3La3 octahedra, and a faceface with one OSrLa4 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 33–35°. In the third O2- site, O2- is bonded to two Sr2+ and three La3+ atoms to form distorted OSr2La3 trigonal bipyramids that share corners with four OSr3La3 octahedra, corners with eight OSr3La2 trigonal bipyramids, corners with two equivalent OSr3La trigonal pyramids, an edgeedge with one OSr2La4 octahedra, edges with four OSr3La2 trigonal bipyramids, and a faceface with one OSr3La3 octahedra. The corner-sharing octahedra tilt angles range from 29–48°. In the fourth O2- site, O2- is bonded to three Sr2+ and two La3+ atoms to form distorted OSr3La2 trigonal bipyramids that share corners with four OSr3La3 octahedra, corners with five OSr2La3 trigonal bipyramids, corners with two equivalent OSr3La trigonal pyramids, edges with two OSr3La3 octahedra, edges with six OSr2La3 trigonal bipyramids, and an edgeedge with one OSr3La trigonal pyramid. The corner-sharing octahedra tilt angles range from 43–66°. In the fifth O2- site, O2- is bonded to two Sr2+ and three La3+ atoms to form distorted OSr2La3 trigonal bipyramids that share corners with four OSr3La3 octahedra, corners with seven OSr2La3 trigonal bipyramids, a cornercorner with one OSr3La trigonal pyramid, edges with two OSr3La3 octahedra, edges with five OSr2La3 trigonal bipyramids, and an edgeedge with one OSr3La trigonal pyramid. The corner-sharing octahedra tilt angles range from 33–67°. In the sixth O2- site, O2- is bonded to one Sr2+ and four La3+ atoms to form distorted OSrLa4 trigonal bipyramids that share corners with four OSr3La3 octahedra, corners with eight OSr2La3 trigonal bipyramids, corners with two equivalent OSr3La trigonal pyramids, an edgeedge with one OSr3La3 octahedra, edges with four OSr3La2 trigonal bipyramids, and a faceface with one OSr2La4 octahedra. The corner-sharing octahedra tilt angles range from 29–50°. In the seventh O2- site, O2- is bonded to three Sr2+ and two La3+ atoms to form distorted OSr3La2 trigonal bipyramids that share corners with four OSr3La3 octahedra, corners with five OSr2La3 trigonal bipyramids, corners with two equivalent OSr3La trigonal pyramids, edges with two OSr3La3 octahedra, edges with six OSr2La3 trigonal bipyramids, and an edgeedge with one OSr3La trigonal pyramid. The corner-sharing octahedra tilt angles range from 45–63°. In the eighth O2- site, O2- is bonded to three Sr2+ and one La3+ atom to form OSr3La trigonal pyramids that share corners with two OSr3La3 octahedra, corners with ten OSr2La3 trigonal bipyramids, edges with two OSr3La3 octahedra, and edges with four OSr3La2 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 50–51°. In the ninth O2- site, O2- is bonded to two Sr2+ and three La3+ atoms to form distorted OSr2La3 trigonal bipyramids that share corners with four OSr3La3 octahedra, corners with seven OSr2La3 trigonal bipyramids, a cornercorner with one OSr3La trigonal pyramid, edges with two OSr3La3 octahedra, edges with five OSr2La3 trigonal bipyramids, and an edgeedge with one OSr3La trigonal pyramid. The corner-sharing octahedra tilt angles range from 37–65°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr3La4O9 by Materials Project

La4Sr3O9 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are six inequivalent Sr2+ sites. In the first Sr2+ site, Sr2+ is bonded to five O2- atoms to form distorted SrO5 trigonal bipyramids that share a cornercorner with one LaO6 octahedra, a cornercorner with one LaO4 tetrahedra, a cornercorner with one SrO5 trigonal bipyramid, corners with two equivalent LaO4 trigonal pyramids, and an edgeedge with one LaO5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 81°. There are a spread of Sr–O bond distances ranging from 2.42–2.67 Å. In the second Sr2+ site, Sr2+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Sr–O bond distances ranging from 2.48–3.06 Å. In the third Sr2+ site, Sr2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Sr–O bond distances ranging from 2.42–3.16 Å. In the fourth Sr2+ site, Sr2+ is bonded to five O2- atoms to form distorted SrO5 trigonal bipyramids that share a cornercorner with one LaO6 octahedra, corners with two equivalent LaO4 tetrahedra, a cornercorner with one SrO5 trigonal bipyramid, corners with two LaO5 trigonal bipyramids, a cornercorner with one LaO4 trigonal pyramid, and an edgeedge with one LaO5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 38°. There are a spread of Sr–O bond distances ranging from 2.43–2.75 Å. In the fifth Sr2+ site, Sr2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Sr–O bond distances ranging from 2.39–3.13 Å. In the sixth Sr2+ site, Sr2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Sr–O bond distances ranging from 2.34–2.82 Å. There are eight inequivalent La3+ sites. In the first La3+ site, La3+ is bonded to five O2- atoms to form distorted LaO5 trigonal bipyramids that share a cornercorner with one LaO6 octahedra, a cornercorner with one LaO4 tetrahedra, a cornercorner with one SrO5 trigonal bipyramid, a cornercorner with one LaO4 trigonal pyramid, an edgeedge with one SrO5 trigonal bipyramid, and an edgeedge with one LaO5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 69°. There are a spread of La–O bond distances ranging from 2.31–2.56 Å. In the second La3+ site, La3+ is bonded in a 5-coordinate geometry to seven O2- atoms. There are a spread of La–O bond distances ranging from 2.29–3.10 Å. In the third La3+ site, La3+ is bonded to five O2- atoms to form distorted LaO5 trigonal bipyramids that share a cornercorner with one LaO4 tetrahedra, a cornercorner with one LaO5 trigonal bipyramid, an edgeedge with one SrO5 trigonal bipyramid, and an edgeedge with one LaO5 trigonal bipyramid. There are a spread of La–O bond distances ranging from 2.24–2.52 Å. In the fourth La3+ site, La3+ is bonded to five O2- atoms to form LaO5 trigonal bipyramids that share a cornercorner with one LaO4 tetrahedra, a cornercorner with one SrO5 trigonal bipyramid, a cornercorner with one LaO5 trigonal bipyramid, and an edgeedge with one LaO6 octahedra. There are a spread of La–O bond distances ranging from 2.29–2.42 Å. In the fifth La3+ site, La3+ is bonded to four O2- atoms to form LaO4 trigonal pyramids that share a cornercorner with one LaO6 octahedra, a cornercorner with one LaO5 trigonal bipyramid, corners with three SrO5 trigonal bipyramids, and an edgeedge with one LaO4 tetrahedra. The corner-sharing octahedral tilt angles are 43°. There are a spread of La–O bond distances ranging from 2.23–2.42 Å. In the sixth La3+ site, La3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of La–O bond distances ranging from 2.35–3.05 Å. In the seventh La3+ site, La3+ is bonded to six O2- atoms to form distorted LaO6 octahedra that share a cornercorner with one LaO5 trigonal bipyramid, corners with two SrO5 trigonal bipyramids, a cornercorner with one LaO4 trigonal pyramid, and an edgeedge with one LaO5 trigonal bipyramid. There are a spread of La–O bond distances ranging from 2.31–2.63 Å. In the eighth La3+ site, La3+ is bonded to four O2- atoms to form distorted LaO4 tetrahedra that share corners with three SrO5 trigonal bipyramids, corners with three LaO5 trigonal bipyramids, and an edgeedge with one LaO4 trigonal pyramid. There are a spread of La–O bond distances ranging from 2.19–2.37 Å. There are eighteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted see-saw-like geometry to three Sr2+ and one La3+ atom. In the second O2- site, O2- is bonded in a distorted see-saw-like geometry to two Sr2+ and two La3+ atoms. In the third O2- site, O2- is bonded to two Sr2+ and three La3+ atoms to form OSr2La3 trigonal bipyramids that share corners with two OSrLa3 tetrahedra, corners with three OSr2La2 trigonal pyramids, an edgeedge with one OSrLa3 tetrahedra, and edges with two OSr2La2 trigonal pyramids. In the fourth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form distorted OSr2La2 trigonal pyramids that share corners with five OSrLa3 tetrahedra, a cornercorner with one OSr2La3 trigonal bipyramid, corners with two OSr2La2 trigonal pyramids, and an edgeedge with one OSr2La2 trigonal pyramid. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to one Sr2+ and three La3+ atoms. In the sixth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form distorted OSr2La2 trigonal pyramids that share corners with four OSrLa3 tetrahedra, a cornercorner with one OSr2La2 trigonal pyramid, an edgeedge with one OSr2La3 trigonal bipyramid, and an edgeedge with one OSr2La2 trigonal pyramid. In the seventh O2- site, O2- is bonded in a 5-coordinate geometry to three Sr2+ and two La3+ atoms. In the eighth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form distorted OSr2La2 trigonal pyramids that share corners with two OSrLa3 tetrahedra, a cornercorner with one OSr2La3 trigonal bipyramid, a cornercorner with one OSr2La2 trigonal pyramid, and an edgeedge with one OSrLa3 tetrahedra. In the ninth O2- site, O2- is bonded to one Sr2+ and three La3+ atoms to form OSrLa3 tetrahedra that share corners with two OSr2La2 tetrahedra, corners with four OSr2La2 trigonal pyramids, an edgeedge with one OSr2La3 trigonal bipyramid, and an edgeedge with one OSr2La2 trigonal pyramid. In the tenth O2- site, O2- is bonded to one Sr2+ and three La3+ atoms to form distorted OSrLa3 tetrahedra that share a cornercorner with one OSr2La3 trigonal bipyramid, corners with five OSr2La2 trigonal pyramids, and an edgeedge with one OSr2La2 tetrahedra. In the eleventh O2- site, O2- is bonded in a distorted trigonal planar geometry to three La3+ atoms. In the twelfth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form distorted OSr2La2 trigonal pyramids that share corners with four OSrLa3 tetrahedra, a cornercorner with one OSr2La3 trigonal bipyramid, a cornercorner with one OSr2La2 trigonal pyramid, an edgeedge with one OSr2La3 trigonal bipyramid, and an edgeedge with one OSr2La2 trigonal pyramid. In the thirteenth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form distorted OSr2La2 trigonal pyramids that share corners with two equivalent OSrLa3 tetrahedra, a cornercorner with one OSr2La2 trigonal pyramid, edges with two OSr2La2 tetrahedra, and an edgeedge with one OSr2La2 trigonal pyramid. In the fourteenth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form distorted OSr2La2 tetrahedra that share a cornercorner with one OSrLa3 tetrahedra, corners with five OSr2La2 trigonal pyramids, an edgeedge with one OSrLa3 tetrahedra, and an edgeedge with one OSr2La2 trigonal pyramid. In the fifteenth O2- site, O2- is bonded in a 4-coordinate geometry to three Sr2+ and three La3+ atoms. In the sixteenth O2- site, O2- is bonded to two Sr2+ and two La3+ atoms to form OSr2La2 tetrahedra that share a cornercorner with one OSrLa3 tetrahedra, a cornercorner with one OSr2La3 trigonal bipyramid, corners with three OSr2La2 trigonal pyramids, and an edgeedge with one OSr2La2 trigonal pyramid. In the seventeenth O2- site, O2- is bonded in a 4-coordinate geometry to two Sr2+ and three La3+ atoms. In the eighteenth O2- site, O2- is bonded in a 4-coordinate geometry to two Sr2+ and two La3+ atoms.

36 MATERIALS SCIENCE↗