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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Mg3Np by Materials Project

Mg3Np is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are three inequivalent Mg sites. In the first Mg site, Mg is bonded in a distorted body-centered cubic geometry to eight equivalent Mg and six Np atoms. All Mg–Mg bond lengths are 3.17 Å. There are two shorter (3.66 Å) and four longer (3.67 Å) Mg–Np bond lengths. In the second Mg site, Mg is bonded in a body-centered cubic geometry to four Mg and four Np atoms. Both Mg–Mg bond lengths are 3.17 Å. All Mg–Np bond lengths are 3.17 Å. In the third Mg site, Mg is bonded in a distorted body-centered cubic geometry to eight equivalent Mg and six Np atoms. There are two shorter (3.66 Å) and four longer (3.67 Å) Mg–Np bond lengths. There are two inequivalent Np sites. In the first Np site, Np is bonded in a distorted body-centered cubic geometry to fourteen Mg atoms. In the second Np site, Np is bonded in a distorted body-centered cubic geometry to fourteen Mg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgNp3 by Materials Project

MgNp3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Mg is bonded to twelve Np atoms to form MgNp12 cuboctahedra that share corners with four equivalent MgNp12 cuboctahedra, corners with eight equivalent NpMg4Np8 cuboctahedra, edges with eight equivalent MgNp12 cuboctahedra, edges with sixteen equivalent NpMg4Np8 cuboctahedra, faces with four equivalent MgNp12 cuboctahedra, and faces with fourteen NpMg4Np8 cuboctahedra. There are eight shorter (3.06 Å) and four longer (3.10 Å) Mg–Np bond lengths. There are two inequivalent Np sites. In the first Np site, Np is bonded to four equivalent Mg and eight equivalent Np atoms to form NpMg4Np8 cuboctahedra that share corners with four equivalent NpMg4Np8 cuboctahedra, corners with eight equivalent MgNp12 cuboctahedra, edges with twenty-four NpMg4Np8 cuboctahedra, faces with six equivalent MgNp12 cuboctahedra, and faces with twelve NpMg4Np8 cuboctahedra. All Np–Np bond lengths are 3.06 Å. In the second Np site, Np is bonded to four equivalent Mg and eight Np atoms to form NpMg4Np8 cuboctahedra that share corners with twelve equivalent NpMg4Np8 cuboctahedra, edges with eight equivalent MgNp12 cuboctahedra, edges with sixteen NpMg4Np8 cuboctahedra, faces with four equivalent MgNp12 cuboctahedra, and faces with fourteen NpMg4Np8 cuboctahedra. All Np–Np bond lengths are 3.10 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgNp3 by Materials Project

MgNp3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mg is bonded to twelve equivalent Np atoms to form MgNp12 cuboctahedra that share corners with twelve equivalent MgNp12 cuboctahedra, edges with twenty-four equivalent NpMg4Np8 cuboctahedra, faces with six equivalent MgNp12 cuboctahedra, and faces with twelve equivalent NpMg4Np8 cuboctahedra. All Mg–Np bond lengths are 3.24 Å. Np is bonded to four equivalent Mg and eight equivalent Np atoms to form NpMg4Np8 cuboctahedra that share corners with twelve equivalent NpMg4Np8 cuboctahedra, edges with eight equivalent MgNp12 cuboctahedra, edges with sixteen equivalent NpMg4Np8 cuboctahedra, faces with four equivalent MgNp12 cuboctahedra, and faces with fourteen equivalent NpMg4Np8 cuboctahedra. All Np–Np bond lengths are 3.24 Å.

36 MATERIALS SCIENCE↗