Iron–nickel alloy

In chemistry, the acronym NiFe refers to an iron–nickel catalyst or component involved in various chemical reactions, or the reactions themselves; in geology, it refers to the main constituents of telluric planetary cores (including Earth's).

Depending on the intended use of the alloy, these are usually fortified with small amounts of other metals, such as chromium, cobalt, molybdenum, and titanium.

Iron and nickel are the most abundant elements produced during the final stage of stellar nucleosynthesis in massive stars.

Heavier elements require other forms of nucleosynthesis, such as during a supernova or neutron star merger.

The surfaces of these metallic compounds provide a complex electron environment for catalyzing chemical reactions.