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5 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 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↗