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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on MgAl2 by Materials Project

MgAl2 crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Mg is bonded to two equivalent Mg and ten Al atoms to form distorted MgMg2Al10 cuboctahedra that share corners with four equivalent AlMg4Al8 cuboctahedra, corners with eight equivalent MgMg2Al10 cuboctahedra, edges with four equivalent MgMg2Al10 cuboctahedra, edges with twelve equivalent AlMg4Al8 cuboctahedra, faces with five equivalent AlMg4Al8 cuboctahedra, and faces with seven equivalent MgMg2Al10 cuboctahedra. Both Mg–Mg bond lengths are 3.07 Å. There are a spread of Mg–Al bond distances ranging from 2.91–3.09 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to four equivalent Mg and eight Al atoms to form AlMg4Al8 cuboctahedra that share corners with four equivalent MgMg2Al10 cuboctahedra, corners with four equivalent AlMg4Al8 cuboctahedra, edges with twelve equivalent MgMg2Al10 cuboctahedra, faces with five equivalent MgMg2Al10 cuboctahedra, and faces with eight equivalent AlMg4Al8 cuboctahedra. There are a spread of Al–Al bond distances ranging from 2.91–2.95 Å. In the second Al site, Al is bonded in a 12-coordinate geometry to six equivalent Mg and six Al atoms. Both Al–Al bond lengths are 3.11 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgAl2(PO5)2 by Materials Project

MgAl2(PO5)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Mg is bonded to six O atoms to form distorted MgO6 octahedra that share corners with two equivalent AlO6 octahedra, corners with four equivalent PO4 tetrahedra, and faces with two equivalent AlO6 octahedra. The corner-sharing octahedral tilt angles are 54°. There are a spread of Mg–O bond distances ranging from 2.03–2.09 Å. Al is bonded to six O atoms to form AlO6 octahedra that share a cornercorner with one MgO6 octahedra, corners with two equivalent AlO6 octahedra, corners with four equivalent PO4 tetrahedra, and a faceface with one MgO6 octahedra. The corner-sharing octahedra tilt angles range from 39–54°. There are a spread of Al–O bond distances ranging from 1.82–2.04 Å. P is bonded to four O atoms to form PO4 tetrahedra that share corners with two equivalent MgO6 octahedra and corners with four equivalent AlO6 octahedra. The corner-sharing octahedra tilt angles range from 30–49°. There are a spread of P–O bond distances ranging from 1.52–1.58 Å. There are five inequivalent O sites. In the first O site, O is bonded in a distorted T-shaped geometry to one Mg, one Al, and one P atom. In the second O site, O is bonded in a bent 150 degrees geometry to one Al and one P atom. In the third O site, O is bonded in a 3-coordinate geometry to one Mg, one Al, and one P atom. In the fourth O site, O is bonded in a bent 150 degrees geometry to one Al and one P atom. In the fifth O site, O is bonded in a distorted T-shaped geometry to one Mg and two equivalent Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgAl2 by Materials Project

MgAl2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Mg is bonded in a 12-coordinate geometry to four equivalent Mg and twelve Al atoms. There are one shorter (3.23 Å) and three longer (3.36 Å) Mg–Mg bond lengths. There are a spread of Mg–Al bond distances ranging from 3.14–3.22 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to six equivalent Mg and six equivalent Al atoms to form a mixture of face, edge, and corner-sharing AlMg6Al6 cuboctahedra. All Al–Al bond lengths are 2.71 Å. In the second Al site, Al is bonded to six equivalent Mg and six Al atoms to form a mixture of face, edge, and corner-sharing AlMg6Al6 cuboctahedra. There are two shorter (2.68 Å) and two longer (2.81 Å) Al–Al bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgAl2 by Materials Project

MgAl2 is Cuprite structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Mg is bonded to six equivalent Al atoms to form a mixture of distorted edge and corner-sharing MgAl6 octahedra. The corner-sharing octahedral tilt angles are 63°. There are two shorter (2.64 Å) and four longer (2.85 Å) Mg–Al bond lengths. Al is bonded in a 4-coordinate geometry to three equivalent Mg and one Al atom. The Al–Al bond length is 2.58 Å.

36 MATERIALS SCIENCE↗