DOE OSTI2020
La8Cu7O19 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are sixteen inequivalent La3+ sites. In the first La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.37–2.78 Å. In the second La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.34–2.83 Å. In the third La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.34–2.79 Å. In the fourth La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.33–2.81 Å. In the fifth La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.35–2.78 Å. In the sixth La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.32–2.85 Å. In the seventh La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.36–2.79 Å. In the eighth La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.36–2.82 Å. In the ninth La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.38–2.82 Å. In the tenth La3+ site, La3+ is bonded in a 7-coordinate geometry to eight O2- atoms. There are a spread of La–O bond distances ranging from 2.32–3.01 Å. In the eleventh La3+ site, La3+ is bonded in a 7-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.35–3.11 Å. In the twelfth La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.35–2.80 Å. In the thirteenth La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.33–2.84 Å. In the fourteenth La3+ site, La3+ is bonded in a 7-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.33–3.10 Å. In the fifteenth La3+ site, La3+ is bonded in a 7-coordinate geometry to eight O2- atoms. There are a spread of La–O bond distances ranging from 2.33–3.00 Å. In the sixteenth La3+ site, La3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.38–2.82 Å. There are fourteen inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Cu–O bond distances ranging from 1.94–2.47 Å. In the second Cu2+ site, Cu2+ is bonded to six O2- atoms to form corner-sharing CuO6 octahedra. The corner-sharing octahedra tilt angles range from 1–3°. There are a spread of Cu–O bond distances ranging from 1.88–2.46 Å. In the third Cu2+ site, Cu2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Cu–O bond distances ranging from 1.92–2.68 Å. In the fourth Cu2+ site, Cu2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Cu–O bond distances ranging from 1.92–2.70 Å. In the fifth Cu2+ site, Cu2+ is bonded to six O2- atoms to form corner-sharing CuO6 octahedra. The corner-sharing octahedra tilt angles range from 1–3°. There are a spread of Cu–O bond distances ranging from 1.88–2.45 Å. In the sixth Cu2+ site, Cu2+ is bonded in a 4-coordinate geometry to six O2- atoms. There are a spread of Cu–O bond distances ranging from 1.95–2.74 Å. In the seventh Cu2+ site, Cu2+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.94–2.10 Å. In the eighth Cu2+ site, Cu2+ is bonded to six O2- atoms to form corner-sharing CuO6 octahedra. The corner-sharing octahedra tilt angles range from 2–3°. There are a spread of Cu–O bond distances ranging from 1.88–2.46 Å. In the ninth Cu2+ site, Cu2+ is bonded to six O2- atoms to form corner-sharing CuO6 octahedra. The corner-sharing octahedra tilt angles range from 1–3°. There are a spread of Cu–O bond distances ranging from 1.88–2.46 Å. In the tenth Cu2+ site, Cu2+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.91–2.04 Å. In the eleventh Cu2+ site, Cu2+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.94–2.03 Å. In the twelfth Cu2+ site, Cu2+ is bonded to six O2- atoms to form corner-sharing CuO6 octahedra. The corner-sharing octahedra tilt angles range from 1–3°. There are a spread of Cu–O bond distances ranging from 1.88–2.44 Å. In the thirteenth Cu2+ site, Cu2+ is bonded to six O2- atoms to form distorted corner-sharing CuO6 octahedra. The corner-sharing octahedra tilt angles range from 1–2°. There are a spread of Cu–O bond distances ranging from 1.89–2.47 Å. In the fourteenth Cu2+ site, Cu2+ is bonded in a rectangular see-saw-like geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.93–2.07 Å. There are thirty-eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to five La3+ and one Cu2+ atom. In the second O2- site, O2- is bonded to four La3+ and two equivalent Cu2+ atoms to form a mixture of distorted edge, corner, and face-sharing OLa4Cu2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the third O2- site, O2- is bonded to four La3+ and two Cu2+ atoms to form a mixture of distorted edge, corner, and face-sharing OLa4Cu2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three La3+ and one Cu2+ atom. In the fifth O2- site, O2- is bonded to four La3+ and two equivalent Cu2+ atoms to form distorted OLa4Cu2 octahedra that share corners with two equivalent OLa4Cu2 octahedra, corners with two equivalent OLa2Cu3 trigonal bipyramids, an edgeedge with one OLa4Cu2 octahedra, and faces with two equivalent OLa4Cu2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the sixth O2- site, O2- is bonded in a 6-coordinate geometry to five La3+ and one Cu2+ atom. In the seventh O2- site, O2- is bonded in a 6-coordinate geometry to four La3+ and two Cu2+ atoms. In the eighth O2- site, O2- is bonded in a 4-coordinate geometry to three La3+ and two Cu2+ atoms. In the ninth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two La3+ and four Cu2+ atoms. In the tenth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one La3+ and four Cu2+ atoms. In the eleventh O2- site, O2- is bonded in a 6-coordinate geometry to five La3+ and one Cu2+ atom. In the twelfth O2- site, O2- is bonded in a 6-coordinate geometry to five La3+ and one Cu2+ atom. In the thirteenth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two La3+ and four Cu2+ atoms. In the fourteenth O2- site, O2- is bonded in a 6-coordinate geometry to four La3+ and two Cu2+ atoms. In the fifteenth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one La3+ and four Cu2+ atoms. In the sixteenth O2- site, O2- is bonded to four La3+ and two equivalent Cu2+ atoms to form a mixture of distorted edge, corner, and face-sharing OLa4Cu2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the seventeenth O2- site, O2- is bonded in a 4-coordinate geometry to three La3+ and two Cu2+ atoms. In the eighteenth O2- site, O2- is bonded to two equivalent La3+ and three Cu2+ atoms to form distorted OLa2Cu3 trigonal bipyramids that share corners with two equivalent OLa4Cu2 octahedra, corners with two equivalent OLa2Cu3 trigonal bipyramids, and an edgeedge with one OLa2Cu3 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 51–55°. In the nineteenth O2- site, O2- is bonded to four La3+ and two equivalent Cu2+ atoms to form distorted OLa4Cu2 octahedra that share corners with two equivalent OLa4Cu2 octahedra, corners with two equivalent OLa2Cu3 trigonal bipyramids, an edgeedge with one OLa4Cu2 octahedra, and faces with two equivalent OLa4Cu2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the twentieth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent La3+ and three Cu2+ atoms. In the twenty-first O2- site, O2- is bonded in a 6-coordinate geometry to four La3+ and two Cu2+ atoms. In the twenty-second O2- site, O2- is bonded to two equivalent La3+ and three Cu2+ atoms to form distorted OLa2Cu3 trigonal bipyramids that share corners with two equivalent OLa4Cu2 octahedra, corners with two equivalent OLa2Cu3 trigonal bipyramids, and an edgeedge with one OLa2Cu3 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 51–55°. In the twenty-third O2- site, O2- is bonded in a 6-coordinate geometry to four La3+ and two Cu2+ atoms. In the twenty-fourth O2- site, O2- is bonded to four La3+ and two equivalent Cu2+ atoms to form a mixture of distorted edge, corner, and face-sharing OLa4Cu2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the twenty-fifth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent La3+ and three Cu2+ atoms. In the twenty-sixth O2- site, O2- is bonded in a 5-coordinate geometry to five La3+ and one Cu2+ atom. In the twenty-seventh O2- site, O2- is bonded in a 6-coordinate geometry to five La3+ and one Cu2+ atom. In the twenty-eighth O2- site, O2- is bonded in a 5-coordinate geometry to five La3+ and one Cu2+ atom. In the twenty-ninth O2- site, O2- is bonded in a 4-coordinate geometry to three La3+ and two Cu2+ atoms. In the thirtieth O2- site, O2- is bonded to four La3+ and two Cu2+ atoms to form a mixture of distorted edge, corner, and face-sharing OLa4Cu2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the thirty-first O2- site, O2- is bonded to four La3+ and two equivalent Cu2+ atoms to form a mixture of distorted edge, corner, and face-sharing OLa4Cu2 octahedra. The corner-sharing octahedral tilt angles are 2°. In the thirty-second O2- site, O2- is bonded in a 6-coordinate geometry to five La3+ and one Cu2+ atom. In the thirty-third O2- site, O2- is bonded in a 6-coordinate geometry to five La3+ and one Cu2+ atom. In the thirty-fourth O2- site, O2- is bonded in a 5-coordinate geometry to five La3+ and one Cu2+ atom. In the thirty-fifth O2- site, O2- is bonded in a 6-coordinate geometry to five La3+ and one Cu2+ atom. In the thirty-sixth O2- site, O2- is bonded in a 6-coordinate geometry to five La3+ and one Cu2+ atom. In the thirty-seventh O2- site, O2- is bonded to four La3+ and two Cu2+ atoms to form a mixture of distorted edge, corner, and face-sharing OLa4Cu2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the thirty-eighth O2- site, O2- is bonded to four La3+ and two Cu2+ atoms to form a mixture of distorted edge, corner, and face-sharing OLa4Cu2 octahedra. The corner-sharing octahedral tilt angles are 1°.