DOE OSTI2020
Ba6Pr2Co4O15 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are twelve inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form distorted BaO12 cuboctahedra that share faces with two equivalent CoO6 octahedra and faces with three CoO4 tetrahedra. There are a spread of Ba–O bond distances ranging from 2.76–3.34 Å. In the second Ba2+ site, Ba2+ is bonded to twelve O2- atoms to form distorted BaO12 cuboctahedra that share faces with two equivalent CoO6 octahedra and faces with three CoO4 tetrahedra. There are a spread of Ba–O bond distances ranging from 2.71–3.30 Å. In the third Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.73–3.36 Å. In the fourth Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.76–3.40 Å. In the fifth Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.81–3.41 Å. In the sixth Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.75–3.32 Å. In the seventh Ba2+ site, Ba2+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Ba–O bond distances ranging from 2.75–3.20 Å. In the eighth Ba2+ site, Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.78–3.45 Å. In the ninth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.59–2.86 Å. In the tenth Ba2+ site, Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ba–O bond distances ranging from 2.59–2.87 Å. In the eleventh Ba2+ site, Ba2+ is bonded to six O2- atoms to form BaO6 octahedra that share corners with six CoO4 tetrahedra and faces with two equivalent BaO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.58–2.78 Å. In the twelfth Ba2+ site, Ba2+ is bonded to six O2- atoms to form BaO6 octahedra that share corners with six CoO4 tetrahedra and faces with two equivalent BaO6 octahedra. There are a spread of Ba–O bond distances ranging from 2.60–2.75 Å. There are four inequivalent Pr3+ sites. In the first Pr3+ site, Pr3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pr–O bond distances ranging from 2.41–2.69 Å. In the second Pr3+ site, Pr3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pr–O bond distances ranging from 2.39–2.73 Å. In the third Pr3+ site, Pr3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pr–O bond distances ranging from 2.44–2.71 Å. In the fourth Pr3+ site, Pr3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pr–O bond distances ranging from 2.38–2.73 Å. There are eight inequivalent Co3+ sites. In the first Co3+ site, Co3+ is bonded to four O2- atoms to form CoO4 tetrahedra that share a cornercorner with one CoO6 octahedra, corners with two BaO6 octahedra, and a faceface with one BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 4–64°. There are a spread of Co–O bond distances ranging from 1.80–1.95 Å. In the second Co3+ site, Co3+ is bonded to four O2- atoms to form CoO4 tetrahedra that share a cornercorner with one CoO6 octahedra, corners with two BaO6 octahedra, and a faceface with one BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 7–66°. There are a spread of Co–O bond distances ranging from 1.82–1.94 Å. In the third Co3+ site, Co3+ is bonded to four O2- atoms to form CoO4 tetrahedra that share a cornercorner with one CoO6 octahedra, corners with two BaO6 octahedra, and a faceface with one BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 6–64°. There are a spread of Co–O bond distances ranging from 1.83–1.92 Å. In the fourth Co3+ site, Co3+ is bonded to four O2- atoms to form CoO4 tetrahedra that share a cornercorner with one CoO6 octahedra, corners with two BaO6 octahedra, and a faceface with one BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 9–68°. There are a spread of Co–O bond distances ranging from 1.81–1.97 Å. In the fifth Co3+ site, Co3+ is bonded to four O2- atoms to form CoO4 tetrahedra that share a cornercorner with one CoO6 octahedra, corners with two BaO6 octahedra, and a faceface with one BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 4–61°. There are a spread of Co–O bond distances ranging from 1.81–1.94 Å. In the sixth Co3+ site, Co3+ is bonded to four O2- atoms to form CoO4 tetrahedra that share a cornercorner with one CoO6 octahedra, corners with two BaO6 octahedra, and a faceface with one BaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 9–67°. There are a spread of Co–O bond distances ranging from 1.81–1.98 Å. In the seventh Co3+ site, Co3+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with three CoO4 tetrahedra and faces with two equivalent BaO12 cuboctahedra. There are a spread of Co–O bond distances ranging from 1.85–2.28 Å. In the eighth Co3+ site, Co3+ is bonded to six O2- atoms to form CoO6 octahedra that share corners with three CoO4 tetrahedra and faces with two equivalent BaO12 cuboctahedra. There are a spread of Co–O bond distances ranging from 1.89–2.24 Å. There are thirty inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to three Ba2+, two Pr3+, and one Co3+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+, one Pr3+, and one Co3+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+, one Pr3+, and one Co3+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three Ba2+, two Pr3+, and one Co3+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+, one Pr3+, and one Co3+ atom. In the sixth O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+, one Pr3+, and one Co3+ atom. In the seventh O2- site, O2- is bonded in a 6-coordinate geometry to three Ba2+, two Pr3+, and one Co3+ atom. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+, one Pr3+, and one Co3+ atom. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+, one Pr3+, and one Co3+ atom. In the tenth O2- site, O2- is bonded in a 2-coordinate geometry to three Ba2+, two Pr3+, and one Co3+ atom. In the eleventh O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+, one Pr3+, and one Co3+ atom. In the twelfth O2- site, O2- is bonded in a 2-coordinate geometry to four Ba2+, one Pr3+, and one Co3+ atom. In the thirteenth O2- site, O2- is bonded in a 6-coordinate geometry to two Ba2+, two Pr3+, and two Co3+ atoms. In the fourteenth O2- site, O2- is bonded in a 6-coordinate geometry to three Ba2+, one Pr3+, and two Co3+ atoms. In the fifteenth O2- site, O2- is bonded in a 6-coordinate geometry to three Ba2+, one Pr3+, and two Co3+ atoms. In the sixteenth O2- site, O2- is bonded in a 6-coordinate geometry to three Ba2+, one Pr3+, and two Co3+ atoms. In the seventeenth O2- site, O2- is bonded in a 6-coordinate geometry to two Ba2+, two Pr3+, and two Co3+ atoms. In the eighteenth O2- site, O2- is bonded in a 6-coordinate geometry to three Ba2+, one Pr3+, and two Co3+ atoms. In the nineteenth O2- site, O2- is bonded to four Ba2+, one Pr3+, and one Co3+ atom to form distorted OBa4PrCo octahedra that share corners with two equivalent OBa4PrCo octahedra and a faceface with one OBa3Pr2Co octahedra. The corner-sharing octahedra tilt angles range from 34–36°. In the twentieth O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+, one Pr3+, and one Co3+ atom. In the twenty-first O2- site, O2- is bonded to three Ba2+, two Pr3+, and one Co3+ atom to form distorted OBa3Pr2Co octahedra that share corners with two equivalent OBa3Pr2Co octahedra and a faceface with one OBa4PrCo octahedra. The corner-sharing octahedral tilt angles are 34°. In the twenty-second O2- site, O2- is bonded to four Ba2+, one Pr3+, and one Co3+ atom to form a mixture of distorted corner and face-sharing OBa4PrCo octahedra. The corner-sharing octahedra tilt angles range from 34–36°. In the twenty-third O2- site, O2- is bonded to four Ba2+, one Pr3+, and one Co3+ atom to form distorted face-sharing OBa4PrCo octahedra. In the twenty-fourth O2- site, O2- is bonded to three Ba2+, two Pr3+, and one Co3+ atom to form distorted OBa3Pr2Co octahedra that share corners with two equivalent OBa3Pr2Co octahedra and faces with two OBa4PrCo octahedra. The corner-sharing octahedral tilt angles are 34°. In the twenty-fifth O2- site, O2- is bonded in a 1-coordinate geometry to five Ba2+ and one Co3+ atom. In the twenty-sixth O2- site, O2- is bonded in a 1-coordinate geometry to four Ba2+ and one Co3+ atom. In the twenty-seventh O2- site, O2- is bonded in a 1-coordinate geometry to five Ba2+ and one Co3+ atom. In the twenty-eighth O2- site, O2- is bonded in a 1-coordinate geometry to five Ba2+ and one Co3+ atom. In the twenty-ninth O2- site, O2- is bonded in a 1-coordinate geometry to five Ba2+ and one Co3+ atom. In the thirtieth O2- site, O2- is bonded in a 1-coordinate geometry to five Ba2+ and one Co3+ atom.