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Table 1 Physical and chemical characteristics of alloys/metals used in study. Formula and the "a" parameter determined from EPMA analyses and from LeBail refinement of XRD data, respectively. The chemical composition of Ni-Fe alloys was confirmed by EPMA as: Ni49.78(± 0.49)Fe50.22(± 0.49) and Ni79.14(± 0.43)Fe20.86(± 0.43).

From: Abiotic ammonium formation in the presence of Ni-Fe metals and alloys and its implications for the Hadean nitrogen cycle

Metal/Alloy

Formula

Manufacturer

Surface Area [m 2 ]

Space Group

Unit cell [Ã…]

Natural analog

Iron

Fe

Alfa Aesar

0.6536 ± 0.0776

Im-3m

2.866(1)

Iron

Nickel

Ni

Alfa Aesar

0.5044 ± 0.0309

Fm-3m

3.523(1)

Nickel

Ni50Fe50

NiFe

Goodfellow

0.3685 ± 0.0094

Fm-3m

3.586(3)

Tetrataenite

Ni81Fe19

Ni3.7Fe

Goodfellow

0.1877 ± 0.0131

Fm-3m

3.547(6)

Awaruite