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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on PrUN2 by Materials Project

UPrN2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. U3+ is bonded to six equivalent N3- atoms to form UN6 octahedra that share corners with six equivalent PrN6 octahedra, edges with six equivalent UN6 octahedra, and edges with six equivalent PrN6 octahedra. The corner-sharing octahedral tilt angles are 10°. All U–N bond lengths are 2.36 Å. Pr3+ is bonded to six equivalent N3- atoms to form PrN6 octahedra that share corners with six equivalent UN6 octahedra, edges with six equivalent UN6 octahedra, and edges with six equivalent PrN6 octahedra. The corner-sharing octahedral tilt angles are 10°. All Pr–N bond lengths are 2.68 Å. N3- is bonded to three equivalent U3+ and three equivalent Pr3+ atoms to form a mixture of edge and corner-sharing NPr3U3 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on PrUN2 by Materials Project

UPrN2 is Caswellsilverite-like structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. U3+ is bonded to six N3- atoms to form UN6 octahedra that share corners with six equivalent UN6 octahedra, edges with four equivalent UN6 octahedra, and edges with eight equivalent PrN6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (2.51 Å) and four longer (2.52 Å) U–N bond lengths. Pr3+ is bonded to six N3- atoms to form PrN6 octahedra that share corners with six equivalent PrN6 octahedra, edges with four equivalent PrN6 octahedra, and edges with eight equivalent UN6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (2.51 Å) and four longer (2.52 Å) Pr–N bond lengths. There are two inequivalent N3- sites. In the first N3- site, N3- is bonded to four equivalent U3+ and two equivalent Pr3+ atoms to form a mixture of corner and edge-sharing NPr2U4 octahedra. The corner-sharing octahedral tilt angles are 0°. In the second N3- site, N3- is bonded to two equivalent U3+ and four equivalent Pr3+ atoms to form NPr4U2 octahedra that share corners with six equivalent NPr4U2 octahedra and edges with twelve NPr2U4 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗