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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na(Mg4Al3)4 by Materials Project

Na(Mg4Al3)4 is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and crystallizes in the monoclinic Cm space group. The structure is three-dimensional. Na is bonded in a 12-coordinate geometry to eight Mg and five Al atoms. There are a spread of Na–Mg bond distances ranging from 3.09–3.64 Å. There are a spread of Na–Al bond distances ranging from 3.01–3.18 Å. There are ten inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to seven Mg and five Al atoms. There are a spread of Mg–Mg bond distances ranging from 3.08–3.17 Å. There are a spread of Mg–Al bond distances ranging from 2.92–3.18 Å. In the second Mg site, Mg is bonded in a 12-coordinate geometry to four Mg and twelve Al atoms. There are a spread of Mg–Mg bond distances ranging from 3.13–3.15 Å. There are a spread of Mg–Al bond distances ranging from 3.15–3.22 Å. In the third Mg site, Mg is bonded in a 10-coordinate geometry to one Na, three Mg, and six Al atoms. Both Mg–Mg bond lengths are 3.06 Å. There are a spread of Mg–Al bond distances ranging from 3.06–3.14 Å. In the fourth Mg site, Mg is bonded in a 11-coordinate geometry to one Na, four Mg, and six Al atoms. Both Mg–Mg bond lengths are 3.06 Å. There are a spread of Mg–Al bond distances ranging from 3.09–3.11 Å. In the fifth Mg site, Mg is bonded in a 12-coordinate geometry to one Na, six Mg, and five Al atoms. There are a spread of Mg–Mg bond distances ranging from 3.07–3.20 Å. There are a spread of Mg–Al bond distances ranging from 2.93–3.25 Å. In the sixth Mg site, Mg is bonded in a 12-coordinate geometry to seven Mg and five Al atoms. There are a spread of Mg–Mg bond distances ranging from 3.15–3.17 Å. There are a spread of Mg–Al bond distances ranging from 2.92–3.19 Å. In the seventh Mg site, Mg is bonded in a 12-coordinate geometry to one Na, six Mg, and five Al atoms. There are a spread of Mg–Mg bond distances ranging from 3.15–3.18 Å. There are a spread of Mg–Al bond distances ranging from 2.91–3.22 Å. In the eighth Mg site, Mg is bonded in a 10-coordinate geometry to four Mg and six Al atoms. Both Mg–Mg bond lengths are 3.06 Å. There are a spread of Mg–Al bond distances ranging from 3.06–3.13 Å. In the ninth Mg site, Mg is bonded in a 12-coordinate geometry to seven Mg and five Al atoms. The Mg–Mg bond length is 3.13 Å. There are a spread of Mg–Al bond distances ranging from 2.91–3.20 Å. In the tenth Mg site, Mg is bonded in a 12-coordinate geometry to one Na, six Mg, and five Al atoms. There are a spread of Mg–Al bond distances ranging from 2.95–3.18 Å. There are seven inequivalent Al sites. In the first Al site, Al is bonded in a 11-coordinate geometry to eight Mg and three Al atoms. There are one shorter (2.69 Å) and two longer (2.77 Å) Al–Al bond lengths. In the second Al site, Al is bonded in a 11-coordinate geometry to one Na, seven Mg, and three Al atoms. There are a spread of Al–Al bond distances ranging from 2.72–2.77 Å. In the third Al site, Al is bonded in a 11-coordinate geometry to eight Mg and three Al atoms. There are a spread of Al–Al bond distances ranging from 2.70–2.78 Å. In the fourth Al site, Al is bonded in a distorted q6 geometry to one Na, seven Mg, and three Al atoms. There are one shorter (2.69 Å) and one longer (2.79 Å) Al–Al bond lengths. In the fifth Al site, Al is bonded in a 11-coordinate geometry to eight Mg and three Al atoms. The Al–Al bond length is 2.77 Å. In the sixth Al site, Al is bonded in a 11-coordinate geometry to one Na, seven Mg, and three Al atoms. In the seventh Al site, Al is bonded in a 11-coordinate geometry to eight Mg and three Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2019

Materials Data on NaMg14Al by Materials Project

NaMg14Al crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. Na is bonded to ten Mg and two equivalent Al atoms to form NaMg10Al2 cuboctahedra that share corners with six equivalent NaMg10Al2 cuboctahedra, corners with twelve MgMg12 cuboctahedra, edges with two equivalent AlNa2Mg10 cuboctahedra, edges with sixteen MgNa2Mg8Al2 cuboctahedra, faces with two equivalent AlNa2Mg10 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra. There are a spread of Na–Mg bond distances ranging from 3.16–3.22 Å. Both Na–Al bond lengths are 3.19 Å. There are ten inequivalent Mg sites. In the first Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with four equivalent NaMg10Al2 cuboctahedra, corners with fourteen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, faces with two equivalent AlNa2Mg10 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.18–3.21 Å. In the second Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with four equivalent AlNa2Mg10 cuboctahedra, corners with fourteen MgMg12 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, faces with two equivalent NaMg10Al2 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.17–3.21 Å. In the third Mg site, Mg is bonded to two equivalent Na, eight Mg, and two equivalent Al atoms to form distorted MgNa2Mg8Al2 cuboctahedra that share corners with eighteen MgMg12 cuboctahedra, edges with two equivalent NaMg10Al2 cuboctahedra, edges with two equivalent AlNa2Mg10 cuboctahedra, edges with fourteen MgNa2Mg8Al2 cuboctahedra, faces with two equivalent NaMg10Al2 cuboctahedra, faces with two equivalent AlNa2Mg10 cuboctahedra, and faces with sixteen MgNa2Mg8Al2 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.15–3.24 Å. There are one shorter (3.15 Å) and one longer (3.21 Å) Mg–Al bond lengths. In the fourth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with four equivalent NaMg10Al2 cuboctahedra, corners with four equivalent AlNa2Mg10 cuboctahedra, corners with ten MgNa2Mg8Al2 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.16–3.23 Å. In the fifth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with four equivalent NaMg10Al2 cuboctahedra, corners with four equivalent AlNa2Mg10 cuboctahedra, corners with ten MgNa2Mg8Al2 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.16–3.23 Å. In the sixth Mg site, Mg is bonded to one Na, ten Mg, and one Al atom to form distorted MgNaMg10Al cuboctahedra that share corners with eighteen MgNaMg10Al cuboctahedra, edges with two equivalent NaMg10Al2 cuboctahedra, edges with two equivalent AlNa2Mg10 cuboctahedra, edges with fourteen MgMg12 cuboctahedra, a faceface with one NaMg10Al2 cuboctahedra, a faceface with one AlNa2Mg10 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.13–3.25 Å. The Mg–Al bond length is 3.16 Å. In the seventh Mg site, Mg is bonded to one Na, ten Mg, and one Al atom to form distorted MgNaMg10Al cuboctahedra that share corners with eighteen MgNaMg10Al cuboctahedra, edges with two equivalent NaMg10Al2 cuboctahedra, edges with two equivalent AlNa2Mg10 cuboctahedra, edges with fourteen MgMg12 cuboctahedra, a faceface with one NaMg10Al2 cuboctahedra, a faceface with one AlNa2Mg10 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.13–3.25 Å. The Mg–Al bond length is 3.16 Å. In the eighth Mg site, Mg is bonded to eleven Mg and one Al atom to form distorted MgMg11Al cuboctahedra that share corners with eighteen MgNaMg10Al cuboctahedra, edges with two equivalent AlNa2Mg10 cuboctahedra, edges with sixteen MgMg12 cuboctahedra, a faceface with one AlNa2Mg10 cuboctahedra, faces with three equivalent NaMg10Al2 cuboctahedra, and faces with sixteen MgMg12 cuboctahedra. There are two shorter (3.19 Å) and one longer (3.23 Å) Mg–Mg bond lengths. The Mg–Al bond length is 3.16 Å. In the ninth Mg site, Mg is bonded to one Na and eleven Mg atoms to form distorted MgNaMg11 cuboctahedra that share corners with eighteen MgNaMg10Al cuboctahedra, edges with two equivalent NaMg10Al2 cuboctahedra, edges with sixteen MgMg12 cuboctahedra, a faceface with one NaMg10Al2 cuboctahedra, faces with three equivalent AlNa2Mg10 cuboctahedra, and faces with sixteen MgMg12 cuboctahedra. The Mg–Mg bond length is 3.16 Å. In the tenth Mg site, Mg is bonded to twelve Mg atoms to form MgMg12 cuboctahedra that share corners with four equivalent NaMg10Al2 cuboctahedra, corners with four equivalent AlNa2Mg10 cuboctahedra, corners with ten MgNa2Mg8Al2 cuboctahedra, edges with eighteen MgMg12 cuboctahedra, and faces with twenty MgMg12 cuboctahedra. Both Mg–Mg bond lengths are 3.19 Å. Al is bonded to two equivalent Na and ten Mg atoms to form AlNa2Mg10 cuboctahedra that share corners with six equivalent AlNa2Mg10 cuboctahedra, corners with twelve MgMg12 cuboctahedra, edges with two equivalent NaMg10Al2 cuboctahedra, edges with sixteen MgNa2Mg8Al2 cuboctahedra, faces with two equivalent NaMg10Al2 cuboctahedra, and faces with eighteen MgMg12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na(Mg4Al3)4 by Materials Project

Na(Mg4Al3)4 crystallizes in the cubic I-43m space group. The structure is three-dimensional. Na is bonded in a 4-coordinate geometry to four equivalent Mg and twelve equivalent Al atoms. All Na–Mg bond lengths are 3.17 Å. All Na–Al bond lengths are 3.24 Å. There are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 10-coordinate geometry to one Na, three equivalent Mg, and six equivalent Al atoms. All Mg–Mg bond lengths are 3.06 Å. All Mg–Al bond lengths are 3.13 Å. In the second Mg site, Mg is bonded in a 12-coordinate geometry to seven Mg and five equivalent Al atoms. There are two shorter (3.14 Å) and four longer (3.17 Å) Mg–Mg bond lengths. There are a spread of Mg–Al bond distances ranging from 2.88–3.18 Å. Al is bonded in a 11-coordinate geometry to one Na, seven Mg, and three equivalent Al atoms. There are one shorter (2.72 Å) and two longer (2.80 Å) Al–Al bond lengths.

36 MATERIALS SCIENCE↗