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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na4NpO5 by Materials Project

Na4NpO5 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Na1+ is bonded to six O2- atoms to form distorted NaO6 octahedra that share a cornercorner with one NpO6 octahedra, corners with five equivalent NaO6 octahedra, edges with three equivalent NpO6 octahedra, and edges with nine equivalent NaO6 octahedra. The corner-sharing octahedra tilt angles range from 0–20°. There are a spread of Na–O bond distances ranging from 2.36–2.82 Å. Np6+ is bonded to six O2- atoms to form NpO6 octahedra that share corners with two equivalent NpO6 octahedra, corners with four equivalent NaO6 octahedra, and edges with twelve equivalent NaO6 octahedra. The corner-sharing octahedra tilt angles range from 0–3°. There are four shorter (2.02 Å) and two longer (2.32 Å) Np–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Na1+ and two equivalent Np6+ atoms to form corner-sharing ONa4Np2 octahedra. The corner-sharing octahedral tilt angles are 0°. In the second O2- site, O2- is bonded in a 6-coordinate geometry to five equivalent Na1+ and one Np6+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na3NpO10 by Materials Project

Na3NpO10 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Na sites. In the first Na site, Na is bonded to six O atoms to form NaO6 octahedra that share corners with four equivalent NpO6 octahedra. The corner-sharing octahedra tilt angles range from 26–61°. There are a spread of Na–O bond distances ranging from 2.28–2.67 Å. In the second Na site, Na is bonded in a 2-coordinate geometry to six O atoms. There are a spread of Na–O bond distances ranging from 2.32–2.91 Å. Np is bonded to six O atoms to form NpO6 octahedra that share corners with four equivalent NaO6 octahedra. The corner-sharing octahedra tilt angles range from 26–61°. There are a spread of Np–O bond distances ranging from 1.88–2.45 Å. There are five inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to one Na, one Np, and one O atom. The O–O bond length is 1.41 Å. In the second O site, O is bonded in a distorted bent 150 degrees geometry to two Na and one Np atom. In the third O site, O is bonded in a trigonal non-coplanar geometry to two Na and one Np atom. In the fourth O site, O is bonded in a distorted T-shaped geometry to two equivalent Na and one O atom. The O–O bond length is 1.34 Å. In the fifth O site, O is bonded in a see-saw-like geometry to two Na and two O atoms.

36 MATERIALS SCIENCE↗