NiFe

  NiFe or Nife is a general shorthand expression for a mixture of nickel (Ni) and iron (Fe). NiFe is used to describe nickel-iron batteries, various chemical reactions that involve a nickel-iron catalyst or component, and in geology to describe the general composition of the Earth's core.

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The affiance of nickel (atomic number 28) and iron (atomic number 26) for one another produce natural occurring alloys, a large number of commercial alloys, and provide a complex electron environment for catalyzing chemical reactions.^[1]

Iron and nickel are notable for being the final elements produced by stellar nucleosynthesis, and thus the heaviest elements which do not require a supernova or similarly cataclysmic event for formation.^[2] Iron and nickel are therefore the most abundant metals in metallic meteorites^[3] and in the dense-metal cores of planets such as Earth.

Notes

1. ^ Pardo, Alejandro et al. (April 2006) "Density functional study of the catalytic cycle of nickel–iron [NiFe] hydrogenases and the involvement of high-spin nickel(II)" Journal of Biological Inorganic Chemistry 11(3): pp. 286-306;
2. ^ Wannier, P. G. et al. (September 1980) "Nuclear Abundances and Evolution of the Interstellar Medium"Annual Review of Astronomy and Astrophysics 18(1): pp. 399-437, (doi: 10.1146/annurev.aa.18.090180.002151);
3. ^ Mason, Brian Harold (1971) Handbook of Elemental Abundances in Meteorites Gordon and Breach, New York, ISBN 0-677-14950-6 ;

See also

• Invar, nickel-iron alloy
• Mu-metal, nickel-iron alloy
• KREEP, geochemical term for lunar impact melt breccias and basalts
• Sial, geochemical term for outer planetary crustal layer
• Sima (geology), geochemical term for inner planetary crustal layer
• Structure of the Earth's Core, NiFe as primary constituent