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Steels and iron alloys formed with other metals (alloy steels) are by far the most common industrial metals because they have a great range of desirable properties and iron-bearing rock is abundant. Iron oxide mixed with aluminium powder can be ignited to create a thermite reaction, used in welding and purifying ores.Iron forms binary compounds with the halogens and the chalcogens.Iron is also the metal at the active site of many important redox enzymes dealing with cellular respiration and oxidation and reduction in plants and animals.A human male of average height has about 4 grams of iron in his body, a female about 3.5 grams.Unlike the metals that form passivating oxide layers, iron oxides occupy more volume than the metal and thus flake off, exposing fresh surfaces for corrosion.
As it cools further to 1394 °C, it changes to its γ-iron allotrope, a face-centered cubic (fcc) crystal structure, or austenite.
Among its organometallic compounds is ferrocene, the first sandwich compound discovered.
Iron plays an important role in biology, forming complexes with molecular oxygen in hemoglobin and myoglobin; these two compounds are common oxygen transport proteins in vertebrates.
The inner core of the Earth is generally presumed to be an iron-nickel alloy with ε (or β) structure.
Somewhat confusingly, the term "β-iron" is sometimes also used to refer to α-iron above its Curie point, when it changes from being ferromagnetic to paramagnetic, even though its crystal structure has not changed.
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The form of iron that is stable under standard conditions can be subjected to pressures up to ca.