Materials Data on Cs2NpO4 by Materials Project
Cs2NpO4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Cs1+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Cs–O bond distances ranging from 3.14–3.51 Å. Np6+ is bonded to six O2- atoms to form corner-sharing NpO6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are two shorter (1.92 Å) and four longer (2.20 Å) Np–O bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to four equivalent Cs1+ and two equivalent Np6+ atoms. In the second O2- site, O2- is bonded in a distorted single-bond geometry to five equivalent Cs1+ and one Np6+ atom.
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