DOE OSTI2020
Ba3Sr3Np2 crystallizes in the tetragonal P-4m2 space group. The structure is three-dimensional. there are three inequivalent Ba sites. In the first Ba site, Ba is bonded in a distorted body-centered cubic geometry to four equivalent Sr and four equivalent Np atoms. All Ba–Sr bond lengths are 3.97 Å. All Ba–Np bond lengths are 3.97 Å. In the second Ba site, Ba is bonded in a distorted body-centered cubic geometry to four equivalent Sr and four equivalent Np atoms. All Ba–Sr bond lengths are 3.97 Å. All Ba–Np bond lengths are 3.97 Å. In the third Ba site, Ba is bonded in a distorted body-centered cubic geometry to four equivalent Sr and four equivalent Np atoms. All Ba–Sr bond lengths are 3.96 Å. All Ba–Np bond lengths are 3.96 Å. There are two inequivalent Sr sites. In the first Sr site, Sr is bonded in a distorted body-centered cubic geometry to six Ba and two equivalent Sr atoms. Both Sr–Sr bond lengths are 3.96 Å. In the second Sr site, Sr is bonded to four equivalent Sr and four equivalent Np atoms to form distorted edge-sharing SrSr4Np4 tetrahedra. All Sr–Np bond lengths are 3.96 Å. Np is bonded in a body-centered cubic geometry to six Ba and two equivalent Sr atoms.