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12 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS2017

Acidic Fluids Across Mars: Detections of Magnesium-Nickel Sulfates

Calcium, magnesium and ferric iron sulfates have been detected by the instrument suites on the Mars rovers. A subset of the magnesium sulfates show clear associations with nickel. These associations indicate Ni(2+) co-precipitation with or substitution for Mg(2+) from sulfate-saturated solutions. Nickel is ex-tracted from primary rocks almost exclusively at pH values less than 6, constraining the formation of these Mg-Ni sulfates to mildly to strongly acidic conditions. There is clear evidence for aqueous alteration at the rim of Endeavour Crater (Meridiani Planum), in the Murray formation mudstone (Gale Crater), and near Home Plate (Gusev Crater). The discovery of Mg-Ni sulfates at these locations indicates a history of fluid-rock interactions at low pH.

Yen, A. S.↗
DOE OSTI2020

Materials Data on Mg2Ni by Materials Project

Mg2Ni is Khatyrkite-like structured and crystallizes in the hexagonal P6_222 space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 4-coordinate geometry to four Ni atoms. All Mg–Ni bond lengths are 2.68 Å. In the second Mg site, Mg is bonded in a 4-coordinate geometry to four Ni atoms. There are two shorter (2.64 Å) and two longer (2.66 Å) Mg–Ni bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a 10-coordinate geometry to eight Mg and two equivalent Ni atoms. Both Ni–Ni bond lengths are 2.60 Å. In the second Ni site, Ni is bonded in a 10-coordinate geometry to eight Mg and two equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgNi2 by Materials Project

MgNi2 is Cubic Laves-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to twelve Ni atoms. All Mg–Ni bond lengths are 2.81 Å. In the second Mg site, Mg is bonded in a 12-coordinate geometry to twelve Ni atoms. All Mg–Ni bond lengths are 2.81 Å. There are three inequivalent Ni sites. In the first Ni site, Ni is bonded to six Mg and six Ni atoms to form a mixture of edge, face, and corner-sharing NiMg6Ni6 cuboctahedra. There are three shorter (2.40 Å) and three longer (2.41 Å) Ni–Ni bond lengths. In the second Ni site, Ni is bonded to six Mg and six Ni atoms to form a mixture of edge, face, and corner-sharing NiMg6Ni6 cuboctahedra. All Ni–Ni bond lengths are 2.40 Å. In the third Ni site, Ni is bonded to six Mg and six Ni atoms to form a mixture of edge, face, and corner-sharing NiMg6Ni6 cuboctahedra. There are two shorter (2.37 Å) and two longer (2.43 Å) Ni–Ni bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgNi by Materials Project

MgNi crystallizes in the trigonal R32 space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a distorted hexagonal planar geometry to six equivalent Mg and six equivalent Ni atoms. All Mg–Mg bond lengths are 2.94 Å. All Mg–Ni bond lengths are 2.48 Å. In the second Mg site, Mg is bonded in a 9-coordinate geometry to seven Mg and nine equivalent Ni atoms. There are one shorter (2.89 Å) and three longer (3.10 Å) Mg–Mg bond lengths. There are a spread of Mg–Ni bond distances ranging from 2.88–2.96 Å. Ni is bonded to eight Mg and four equivalent Ni atoms to form a mixture of distorted edge, corner, and face-sharing NiMg8Ni4 cuboctahedra. All Ni–Ni bond lengths are 2.50 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgNi by Materials Project

MgNi 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 Ni atoms. All Mg–Ni bond lengths are 2.64 Å. Ni is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgNi by Materials Project

MgNi is Tetraauricupride structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight equivalent Ni atoms. All Mg–Ni bond lengths are 2.64 Å. Ni is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgNi3 by Materials Project

MgNi3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Mg is bonded to twelve Ni atoms to form MgNi12 cuboctahedra that share corners with four equivalent MgNi12 cuboctahedra, corners with eight equivalent NiMg4Ni8 cuboctahedra, edges with eight equivalent MgNi12 cuboctahedra, edges with sixteen equivalent NiMg4Ni8 cuboctahedra, faces with four equivalent MgNi12 cuboctahedra, and faces with fourteen NiMg4Ni8 cuboctahedra. There are eight shorter (2.57 Å) and four longer (2.59 Å) Mg–Ni bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded to four equivalent Mg and eight equivalent Ni atoms to form distorted NiMg4Ni8 cuboctahedra that share corners with four equivalent NiMg4Ni8 cuboctahedra, corners with eight equivalent MgNi12 cuboctahedra, edges with twenty-four NiMg4Ni8 cuboctahedra, faces with six equivalent MgNi12 cuboctahedra, and faces with twelve NiMg4Ni8 cuboctahedra. All Ni–Ni bond lengths are 2.57 Å. In the second Ni site, Ni is bonded to four equivalent Mg and eight Ni atoms to form distorted NiMg4Ni8 cuboctahedra that share corners with twelve equivalent NiMg4Ni8 cuboctahedra, edges with eight equivalent MgNi12 cuboctahedra, edges with sixteen NiMg4Ni8 cuboctahedra, faces with four equivalent MgNi12 cuboctahedra, and faces with fourteen NiMg4Ni8 cuboctahedra. All Ni–Ni bond lengths are 2.59 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgNi2 by Materials Project

MgNi2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Mg is bonded in a distorted body-centered cubic geometry to eight equivalent Ni atoms. All Mg–Ni bond lengths are 2.64 Å. Ni is bonded in a 8-coordinate geometry to four equivalent Mg and four equivalent Ni atoms. All Ni–Ni bond lengths are 2.42 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgNi5 by Materials Project

MgNi5 crystallizes in the trigonal R32 space group. The structure is three-dimensional. Mg is bonded to twelve Ni atoms to form MgNi12 cuboctahedra that share corners with six equivalent MgNi12 cuboctahedra, corners with twelve NiMg3Ni9 cuboctahedra, edges with six equivalent MgNi12 cuboctahedra, edges with twelve NiMg2Ni10 cuboctahedra, and faces with twenty NiMg2Ni10 cuboctahedra. All Mg–Ni bond lengths are 2.55 Å. There are nine inequivalent Ni sites. In the first Ni site, Ni is bonded to two equivalent Mg and ten Ni atoms to form distorted NiMg2Ni10 cuboctahedra that share corners with eighteen NiMg2Ni10 cuboctahedra, edges with four equivalent MgNi12 cuboctahedra, edges with fourteen NiMg2Ni10 cuboctahedra, faces with four equivalent MgNi12 cuboctahedra, and faces with sixteen NiMg2Ni10 cuboctahedra. There are a spread of Ni–Ni bond distances ranging from 2.47–2.59 Å. In the second Ni site, Ni is bonded to two equivalent Mg and ten Ni atoms to form distorted NiMg2Ni10 cuboctahedra that share corners with eighteen NiMg2Ni10 cuboctahedra, edges with four equivalent MgNi12 cuboctahedra, edges with fourteen NiMg2Ni10 cuboctahedra, faces with four equivalent MgNi12 cuboctahedra, and faces with sixteen NiMg2Ni10 cuboctahedra. There are a spread of Ni–Ni bond distances ranging from 2.47–2.59 Å. In the third Ni site, Ni is bonded to two equivalent Mg and ten Ni atoms to form distorted NiMg2Ni10 cuboctahedra that share corners with eighteen NiMg2Ni10 cuboctahedra, edges with four equivalent MgNi12 cuboctahedra, edges with fourteen NiMg2Ni10 cuboctahedra, faces with four equivalent MgNi12 cuboctahedra, and faces with sixteen NiMg2Ni10 cuboctahedra. There are a spread of Ni–Ni bond distances ranging from 2.47–2.59 Å. In the fourth Ni site, Ni is bonded to three equivalent Mg and nine Ni atoms to form distorted NiMg3Ni9 cuboctahedra that share corners with six equivalent MgNi12 cuboctahedra, corners with twelve NiMg3Ni9 cuboctahedra, edges with eighteen NiMg2Ni10 cuboctahedra, faces with four equivalent MgNi12 cuboctahedra, and faces with sixteen NiMg2Ni10 cuboctahedra. There are one shorter (2.51 Å) and three longer (2.55 Å) Ni–Ni bond lengths. In the fifth Ni site, Ni is bonded to three equivalent Mg and nine Ni atoms to form distorted NiMg3Ni9 cuboctahedra that share corners with six equivalent MgNi12 cuboctahedra, corners with twelve NiMg3Ni9 cuboctahedra, edges with eighteen NiMg2Ni10 cuboctahedra, faces with four equivalent MgNi12 cuboctahedra, and faces with sixteen NiMg2Ni10 cuboctahedra. The Ni–Ni bond length is 2.55 Å. In the sixth Ni site, Ni is bonded to three equivalent Mg and nine Ni atoms to form distorted NiMg3Ni9 cuboctahedra that share corners with six equivalent MgNi12 cuboctahedra, corners with twelve NiMg3Ni9 cuboctahedra, edges with eighteen NiMg2Ni10 cuboctahedra, faces with four equivalent MgNi12 cuboctahedra, and faces with sixteen NiMg2Ni10 cuboctahedra. All Ni–Mg bond lengths are 2.55 Å. There are two shorter (2.51 Å) and six longer (2.55 Å) Ni–Ni bond lengths. In the seventh Ni site, Ni is bonded to two equivalent Mg and ten Ni atoms to form distorted NiMg2Ni10 cuboctahedra that share corners with eighteen NiMg2Ni10 cuboctahedra, edges with four equivalent MgNi12 cuboctahedra, edges with fourteen NiMg3Ni9 cuboctahedra, faces with four equivalent MgNi12 cuboctahedra, and faces with sixteen NiMg2Ni10 cuboctahedra. Both Ni–Mg bond lengths are 2.55 Å. There are a spread of Ni–Ni bond distances ranging from 2.47–2.59 Å. In the eighth Ni site, Ni is bonded to two equivalent Mg and ten Ni atoms to form distorted NiMg2Ni10 cuboctahedra that share corners with eighteen NiMg2Ni10 cuboctahedra, edges with four equivalent MgNi12 cuboctahedra, edges with fourteen NiMg3Ni9 cuboctahedra, faces with four equivalent MgNi12 cuboctahedra, and faces with sixteen NiMg2Ni10 cuboctahedra. The Ni–Ni bond length is 2.51 Å. In the ninth Ni site, Ni is bonded to three equivalent Mg and nine Ni atoms to form distorted NiMg3Ni9 cuboctahedra that share corners with six equivalent MgNi12 cuboctahedra, corners with twelve NiMg3Ni9 cuboctahedra, edges with eighteen NiMg2Ni10 cuboctahedra, faces with four equivalent MgNi12 cuboctahedra, and faces with sixteen NiMg2Ni10 cuboctahedra. All Ni–Mg bond lengths are 2.55 Å. All Ni–Ni bond lengths are 2.55 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgNi by Materials Project

MgNi is Tetraauricupride structured and crystallizes in the orthorhombic Pmma space group. The structure is three-dimensional. Mg is bonded in a body-centered cubic geometry to eight equivalent Ni atoms. There are two shorter (2.63 Å) and six longer (2.64 Å) Mg–Ni bond lengths. Ni is bonded in a body-centered cubic geometry to eight equivalent Mg atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MgNi2 by Materials Project

MgNi2 is Cubic Laves structured and crystallizes in the trigonal R32 space group. The structure is three-dimensional. Mg is bonded in a 12-coordinate geometry to twelve Ni atoms. There are a spread of Mg–Ni bond distances ranging from 2.81–2.83 Å. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded to six equivalent Mg and six equivalent Ni atoms to form a mixture of corner, edge, and face-sharing NiMg6Ni6 cuboctahedra. All Ni–Ni bond lengths are 2.41 Å. In the second Ni site, Ni is bonded to six equivalent Mg and six Ni atoms to form a mixture of corner, edge, and face-sharing NiMg6Ni6 cuboctahedra. All Ni–Ni bond lengths are 2.41 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg2Ni by Materials Project

Mg2Ni is Khatyrkite structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 4-coordinate geometry to four equivalent Ni atoms. There are two shorter (2.64 Å) and two longer (2.65 Å) Mg–Ni bond lengths. In the second Mg site, Mg is bonded in a 4-coordinate geometry to four equivalent Ni atoms. There are two shorter (2.64 Å) and two longer (2.66 Å) Mg–Ni bond lengths. Ni is bonded in a 10-coordinate geometry to eight Mg atoms.

36 MATERIALS SCIENCE↗