SEARCH · Search NASA
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
PrMg is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight equivalent Pr atoms. All Mg–Pr bond lengths are 3.39 Å. Pr is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.
PrMg2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Mg is bonded to six equivalent Mg and six equivalent Pr atoms to form a mixture of edge, face, and corner-sharing MgPr6Mg6 cuboctahedra. All Mg–Mg bond lengths are 3.08 Å. All Mg–Pr bond lengths are 3.61 Å. Pr is bonded in a 12-coordinate geometry to twelve equivalent Mg and four equivalent Pr atoms. All Pr–Pr bond lengths are 3.77 Å.
PrMg12 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 to ten Mg and two equivalent Pr atoms to form a mixture of distorted corner, edge, and face-sharing MgPr2Mg10 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 2.93–3.16 Å. Both Mg–Pr bond lengths are 3.94 Å. In the second Mg site, Mg is bonded in a distorted q6 geometry to ten Mg and two equivalent Pr atoms. There are a spread of Mg–Mg bond distances ranging from 3.12–3.35 Å. Both Mg–Pr bond lengths are 3.66 Å. In the third Mg site, Mg is bonded in a 10-coordinate geometry to nine Mg and one Pr atom. The Mg–Mg bond length is 3.06 Å. The Mg–Pr bond length is 3.65 Å. Pr is bonded in a 12-coordinate geometry to twenty Mg atoms.
Mg3Pr is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 8-coordinate geometry to eight equivalent Mg and six equivalent Pr atoms. All Mg–Mg bond lengths are 3.22 Å. All Mg–Pr bond lengths are 3.72 Å. In the second Mg site, Mg is bonded in a body-centered cubic geometry to four equivalent Mg and four equivalent Pr atoms. All Mg–Pr bond lengths are 3.22 Å. Pr is bonded in a distorted body-centered cubic geometry to fourteen Mg atoms.
MgPr2 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of two MgPr2 sheets oriented in the (1, 0, 0) direction. Mg is bonded in a body-centered cubic geometry to eight Pr atoms. There are a spread of Mg–Pr bond distances ranging from 3.40–3.43 Å. There are two inequivalent Pr sites. In the first Pr site, Pr is bonded in a 4-coordinate geometry to four equivalent Mg atoms. In the second Pr site, Pr is bonded in a 12-coordinate geometry to four equivalent Mg atoms.