DOE OSTI2020
Ba3La7Ti3Cr7O30 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are three inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form distorted BaO12 cuboctahedra that share corners with two equivalent BaO12 cuboctahedra, faces with four BaO12 cuboctahedra, faces with three CrO6 octahedra, and faces with five TiO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.71–3.13 Å. In the second Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form distorted BaO12 cuboctahedra that share corners with six BaO12 cuboctahedra, faces with two equivalent BaO12 cuboctahedra, faces with three CrO6 octahedra, and faces with five TiO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.69–3.14 Å. In the third Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form distorted BaO12 cuboctahedra that share corners with six BaO12 cuboctahedra, faces with two equivalent BaO12 cuboctahedra, faces with four TiO6 octahedra, and faces with four CrO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.64–3.15 Å. There are seven inequivalent La3+ sites. In the first La3+ site, La3+ is bonded in a 11-coordinate geometry to eleven O2- atoms. There are a spread of La–O bond distances ranging from 2.42–2.91 Å. In the second La3+ site, La3+ is bonded in a 3-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.40–2.87 Å. In the third La3+ site, La3+ is bonded in a 3-coordinate geometry to ten O2- atoms. There are a spread of La–O bond distances ranging from 2.41–2.91 Å. In the fourth La3+ site, La3+ is bonded in a 12-coordinate geometry to nine O2- atoms. There are a spread of La–O bond distances ranging from 2.40–2.90 Å. In the fifth La3+ site, La3+ is bonded in a 3-coordinate geometry to ten O2- atoms. There are a spread of La–O bond distances ranging from 2.45–2.89 Å. In the sixth La3+ site, La3+ is bonded in a 3-coordinate geometry to ten O2- atoms. There are a spread of La–O bond distances ranging from 2.40–2.87 Å. In the seventh La3+ site, La3+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of La–O bond distances ranging from 2.43–3.11 Å. There are three inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with four CrO6 octahedra, and faces with five BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 6–16°. There are a spread of Ti–O bond distances ranging from 1.95–2.03 Å. In the second Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent CrO6 octahedra, corners with four TiO6 octahedra, and faces with five BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 6–14°. There are a spread of Ti–O bond distances ranging from 1.91–2.04 Å. In the third Ti4+ site, Ti4+ is bonded to six O2- atoms to form TiO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with four CrO6 octahedra, and faces with four BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 6–18°. There are a spread of Ti–O bond distances ranging from 1.93–2.01 Å. There are seven inequivalent Cr3+ sites. In the first Cr3+ site, Cr3+ is bonded to six O2- atoms to form CrO6 octahedra that share corners with two equivalent CrO6 octahedra, corners with four TiO6 octahedra, and faces with four BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 6–22°. There are a spread of Cr–O bond distances ranging from 1.99–2.07 Å. In the second Cr3+ site, Cr3+ is bonded to six O2- atoms to form CrO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with four CrO6 octahedra, and a faceface with one BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 9–23°. There are a spread of Cr–O bond distances ranging from 2.00–2.03 Å. In the third Cr3+ site, Cr3+ is bonded to six O2- atoms to form CrO6 octahedra that share corners with six CrO6 octahedra and a faceface with one BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 9–24°. There are a spread of Cr–O bond distances ranging from 2.00–2.03 Å. In the fourth Cr3+ site, Cr3+ is bonded to six O2- atoms to form corner-sharing CrO6 octahedra. The corner-sharing octahedra tilt angles range from 18–24°. There are a spread of Cr–O bond distances ranging from 1.99–2.02 Å. In the fifth Cr3+ site, Cr3+ is bonded to six O2- atoms to form corner-sharing CrO6 octahedra. The corner-sharing octahedra tilt angles range from 18–23°. There are a spread of Cr–O bond distances ranging from 1.99–2.02 Å. In the sixth Cr3+ site, Cr3+ is bonded to six O2- atoms to form CrO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with four CrO6 octahedra, and faces with two BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 6–22°. There are a spread of Cr–O bond distances ranging from 1.99–2.03 Å. In the seventh Cr3+ site, Cr3+ is bonded to six O2- atoms to form CrO6 octahedra that share corners with two equivalent TiO6 octahedra, corners with four CrO6 octahedra, and faces with two BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 9–22°. There are a spread of Cr–O bond distances ranging from 1.99–2.04 Å. There are thirty inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to three Ba2+, one La3+, and two Ti4+ atoms. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Ba2+, one La3+, and two Ti4+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to three Ba2+, one La3+, one Ti4+, and one Cr3+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Ba2+, three La3+, and two Cr3+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to three Ba2+, one La3+, and two Ti4+ atoms. In the sixth O2- site, O2- is bonded in a 6-coordinate geometry to three Ba2+, one La3+, one Ti4+, and one Cr3+ atom. In the seventh O2- site, O2- is bonded in a distorted linear geometry to one Ba2+, three La3+, one Ti4+, and one Cr3+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one Ba2+, three La3+, one Ti4+, and one Cr3+ atom. In the ninth O2- site, O2- is bonded in a 2-coordinate geometry to three Ba2+, one La3+, one Ti4+, and one Cr3+ atom. In the tenth O2- site, O2- is bonded in a 5-coordinate geometry to three La3+ and two Cr3+ atoms. In the eleventh O2- site, O2- is bonded in a 5-coordinate geometry to one Ba2+, two La3+, and two Cr3+ atoms. In the twelfth O2- site, O2- is bonded in a 5-coordinate geometry to three La3+ and two Cr3+ atoms. In the thirteenth O2- site, O2- is bonded in a 2-coordinate geometry to one Ba2+, three La3+, and two Cr3+ atoms. In the fourteenth O2- site, O2- is bonded in a 5-coordinate geometry to three La3+ and two Cr3+ atoms. In the fifteenth O2- site, O2- is bonded in a 5-coordinate geometry to one Ba2+, two La3+, one Ti4+, and one Cr3+ atom. In the sixteenth O2- site, O2- is bonded in a 5-coordinate geometry to three La3+ and two Cr3+ atoms. In the seventeenth O2- site, O2- is bonded in a 5-coordinate geometry to three La3+ and two Cr3+ atoms. In the eighteenth O2- site, O2- is bonded in a 3-coordinate geometry to three La3+ and two Cr3+ atoms. In the nineteenth O2- site, O2- is bonded in a 3-coordinate geometry to four La3+ and two Cr3+ atoms. In the twentieth O2- site, O2- is bonded in a 5-coordinate geometry to three La3+ and two Cr3+ atoms. In the twenty-first O2- site, O2- is bonded in a 5-coordinate geometry to three La3+ and two Cr3+ atoms. In the twenty-second O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+, two La3+, one Ti4+, and one Cr3+ atom. In the twenty-third O2- site, O2- is bonded in a 5-coordinate geometry to three La3+ and two Cr3+ atoms. In the twenty-fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Ba2+, three La3+, and two Cr3+ atoms. In the twenty-fifth O2- site, O2- is bonded in a 6-coordinate geometry to one Ba2+, three La3+, and two Cr3+ atoms. In the twenty-sixth O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+, two La3+, one Ti4+, and one Cr3+ atom. In the twenty-seventh O2- site, O2- is bonded in a 5-coordinate geometry to three La3+ and two Cr3+ atoms. In the twenty-eighth O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+, two La3+, one Ti4+, and one Cr3+ atom. In the twenty-ninth O2- site, O2- is bonded in a 2-coordinate geometry to three Ba2+, one La3+, and two Ti4+ atoms. In the thirtieth O2- site, O2- is bonded in a 2-coordinate geometry to two Ba2+, two La3+, one Ti4+, and one Cr3+ atom.