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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on NdBiRu2O7 by Materials Project

NdBiRu2O7 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. Nd3+ is bonded to eight O2- atoms to form distorted NdO8 hexagonal bipyramids that share edges with two equivalent NdO8 hexagonal bipyramids, edges with four equivalent BiO8 hexagonal bipyramids, and edges with six RuO6 octahedra. There are a spread of Nd–O bond distances ranging from 2.26–2.58 Å. There are two inequivalent Ru4+ sites. In the first Ru4+ site, Ru4+ is bonded to six O2- atoms to form RuO6 octahedra that share corners with six RuO6 octahedra, edges with two equivalent BiO8 hexagonal bipyramids, and edges with four equivalent NdO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 47–48°. There are two shorter (2.01 Å) and four longer (2.02 Å) Ru–O bond lengths. In the second Ru4+ site, Ru4+ is bonded to six O2- atoms to form RuO6 octahedra that share corners with six RuO6 octahedra, edges with two equivalent NdO8 hexagonal bipyramids, and edges with four equivalent BiO8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 47°. There are four shorter (2.00 Å) and two longer (2.02 Å) Ru–O bond lengths. Bi3+ is bonded to eight O2- atoms to form distorted BiO8 hexagonal bipyramids that share edges with two equivalent BiO8 hexagonal bipyramids, edges with four equivalent NdO8 hexagonal bipyramids, and edges with six RuO6 octahedra. There are two shorter (2.25 Å) and six longer (2.57 Å) Bi–O bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Nd3+ and two equivalent Bi3+ atoms to form ONd2Bi2 tetrahedra that share corners with six ONd2Bi2 tetrahedra and an edgeedge with one ONd2Ru2 tetrahedra. In the second O2- site, O2- is bonded in a 4-coordinate geometry to one Nd3+, two Ru4+, and one Bi3+ atom. In the third O2- site, O2- is bonded to two equivalent Nd3+ and two equivalent Ru4+ atoms to form a mixture of distorted corner and edge-sharing ONd2Ru2 tetrahedra. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ru4+ and two equivalent Bi3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NdBi3(Ru2O7)2 by Materials Project

NdBi3(Ru2O7)2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Nd3+ is bonded to eight O2- atoms to form distorted NdO8 hexagonal bipyramids that share edges with six equivalent BiO8 hexagonal bipyramids and edges with six equivalent RuO6 octahedra. There are two shorter (2.26 Å) and six longer (2.57 Å) Nd–O bond lengths. There are two inequivalent Ru4+ sites. In the first Ru4+ site, Ru4+ is bonded to six equivalent O2- atoms to form RuO6 octahedra that share corners with six equivalent RuO6 octahedra and edges with six equivalent BiO8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 48°. All Ru–O bond lengths are 2.01 Å. In the second Ru4+ site, Ru4+ is bonded to six O2- atoms to form RuO6 octahedra that share corners with six RuO6 octahedra, edges with two equivalent NdO8 hexagonal bipyramids, and edges with four equivalent BiO8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 48°. There are four shorter (2.01 Å) and two longer (2.03 Å) Ru–O bond lengths. Bi3+ is bonded to eight O2- atoms to form distorted BiO8 hexagonal bipyramids that share edges with two equivalent NdO8 hexagonal bipyramids, edges with four equivalent BiO8 hexagonal bipyramids, and edges with six RuO6 octahedra. There are a spread of Bi–O bond distances ranging from 2.25–2.57 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to one Nd3+ and three equivalent Bi3+ atoms to form corner-sharing ONdBi3 tetrahedra. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two Ru4+ and two equivalent Bi3+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to one Nd3+, two equivalent Ru4+, and one Bi3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Nd3Bi(Ru2O7)2 by Materials Project

Nd3Bi(Ru2O7)2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Nd3+ is bonded to eight O2- atoms to form distorted NdO8 hexagonal bipyramids that share edges with two equivalent BiO8 hexagonal bipyramids, edges with four equivalent NdO8 hexagonal bipyramids, and edges with six RuO6 octahedra. There are a spread of Nd–O bond distances ranging from 2.26–2.58 Å. There are two inequivalent Ru4+ sites. In the first Ru4+ site, Ru4+ is bonded to six equivalent O2- atoms to form RuO6 octahedra that share corners with six equivalent RuO6 octahedra and edges with six equivalent NdO8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 49°. All Ru–O bond lengths are 2.03 Å. In the second Ru4+ site, Ru4+ is bonded to six O2- atoms to form RuO6 octahedra that share corners with six RuO6 octahedra, edges with two equivalent BiO8 hexagonal bipyramids, and edges with four equivalent NdO8 hexagonal bipyramids. The corner-sharing octahedra tilt angles range from 47–49°. All Ru–O bond lengths are 2.02 Å. Bi3+ is bonded to eight O2- atoms to form distorted BiO8 hexagonal bipyramids that share edges with six equivalent NdO8 hexagonal bipyramids and edges with six equivalent RuO6 octahedra. There are two shorter (2.26 Å) and six longer (2.57 Å) Bi–O bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Nd3+ and one Bi3+ atom to form a mixture of edge and corner-sharing ONd3Bi tetrahedra. In the second O2- site, O2- is bonded to two equivalent Nd3+ and two Ru4+ atoms to form a mixture of distorted edge and corner-sharing ONd2Ru2 tetrahedra. In the third O2- site, O2- is bonded in a 4-coordinate geometry to one Nd3+, two equivalent Ru4+, and one Bi3+ atom.

36 MATERIALS SCIENCE↗