DOE OSTI2020
Pr6O11 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are twelve inequivalent Pr+3.67+ sites. In the first Pr+3.67+ site, Pr+3.67+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Pr–O bond distances ranging from 2.46–2.57 Å. In the second Pr+3.67+ site, Pr+3.67+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Pr–O bond distances ranging from 2.40–2.60 Å. In the third Pr+3.67+ site, Pr+3.67+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Pr–O bond distances ranging from 2.40–2.61 Å. In the fourth Pr+3.67+ site, Pr+3.67+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Pr–O bond distances ranging from 2.43–2.71 Å. In the fifth Pr+3.67+ site, Pr+3.67+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are a spread of Pr–O bond distances ranging from 2.42–2.60 Å. In the sixth Pr+3.67+ site, Pr+3.67+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Pr–O bond distances ranging from 2.35–2.48 Å. In the seventh Pr+3.67+ site, Pr+3.67+ is bonded to seven O2- atoms to form distorted PrO7 pentagonal bipyramids that share a cornercorner with one PrO7 hexagonal pyramid, a cornercorner with one PrO6 octahedra, edges with two PrO7 hexagonal pyramids, an edgeedge with one PrO6 octahedra, and edges with two equivalent PrO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 55°. There are a spread of Pr–O bond distances ranging from 2.40–2.55 Å. In the eighth Pr+3.67+ site, Pr+3.67+ is bonded to seven O2- atoms to form distorted PrO7 hexagonal pyramids that share a cornercorner with one PrO6 octahedra, a cornercorner with one PrO7 pentagonal bipyramid, an edgeedge with one PrO7 hexagonal pyramid, an edgeedge with one PrO6 octahedra, and an edgeedge with one PrO7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 58°. There are a spread of Pr–O bond distances ranging from 2.40–2.49 Å. In the ninth Pr+3.67+ site, Pr+3.67+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Pr–O bond distances ranging from 2.38–2.51 Å. In the tenth Pr+3.67+ site, Pr+3.67+ is bonded to seven O2- atoms to form distorted PrO7 hexagonal pyramids that share a cornercorner with one PrO6 octahedra, an edgeedge with one PrO7 hexagonal pyramid, an edgeedge with one PrO6 octahedra, and an edgeedge with one PrO7 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 55°. There are a spread of Pr–O bond distances ranging from 2.40–2.54 Å. In the eleventh Pr+3.67+ site, Pr+3.67+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Pr–O bond distances ranging from 2.35–2.53 Å. In the twelfth Pr+3.67+ site, Pr+3.67+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing PrO6 octahedra. There are a spread of Pr–O bond distances ranging from 2.36–2.40 Å. There are twenty-two inequivalent O2- sites. In the first O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the second O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of distorted edge and corner-sharing OPr4 tetrahedra. In the third O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of distorted edge and corner-sharing OPr4 tetrahedra. In the fourth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the fifth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of distorted edge and corner-sharing OPr4 tetrahedra. In the sixth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the seventh O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the eighth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of distorted edge and corner-sharing OPr4 tetrahedra. In the ninth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the tenth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the eleventh O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the twelfth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the thirteenth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the fourteenth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the fifteenth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of distorted edge and corner-sharing OPr4 tetrahedra. In the sixteenth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the seventeenth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of distorted edge and corner-sharing OPr4 tetrahedra. In the eighteenth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of distorted edge and corner-sharing OPr4 tetrahedra. In the nineteenth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the twentieth O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the twenty-first O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the twenty-second O2- site, O2- is bonded to four Pr+3.67+ atoms to form a mixture of distorted edge and corner-sharing OPr4 tetrahedra.