Materials Data on NpPS4 by Materials Project

Abstract

NpPS4 is Zircon-like structured and crystallizes in the tetragonal I4_1/acd space group. The structure is three-dimensional. there are two inequivalent Np3+ sites. In the first Np3+ site, Np3+ is bonded in a distorted body-centered cubic geometry to eight S2- atoms. There are four shorter (2.93 Å) and four longer (2.95 Å) Np–S bond lengths. In the second Np3+ site, Np3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are four shorter (2.88 Å) and four longer (3.01 Å) Np–S bond lengths. P5+ is bonded in a tetrahedral geometry to four S2- atoms. There are two shorter (2.05 Å) and two longer (2.06 Å) P–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to two Np3+ and one P5+ atom. In the second S2- site, S2- is bonded in a 3-coordinate geometry to two Np3+ and one P5+ atom.