Ba3Np is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to four equivalent Ba(2) and four equivalent Np(1) atoms to form a mixture of distorted corner, edge, and face-sharing BaBa4Np4 tetrahedra. In the second Ba site, Ba(2) is bonded in a distorted body-centered cubic geometry to eight equivalent Ba(1) atoms. Np(1) is bonded in a body-centered cubic geometry to eight equivalent Ba(1) atoms.
Ba3Np is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to four equivalent Ba(2) and four equivalent Np(1) atoms to form a mixture of distorted corner, edge, and face-sharing BaBa4Np4 tetrahedra. All Ba(1)-Ba(2) bond lengths are 4.17 Å. All Ba(1)-Np(1) bond lengths are 4.17 Å. In the second Ba site, Ba(2) is bonded in a distorted body-centered cubic geometry to eight equivalent Ba(1) atoms. Np(1) is bonded in a body-centered cubic geometry to eight equivalent Ba(1) atoms.