Allotropes of metals / Polymorphism of metals

Playlist “Materials science“ Some elements can change their crystalline structure, i.e. type of crystal lattice, depending on external conditions - temperature and pressure. The ability of one element to exist in several crystalline modifications is called polymorphism or allotropy. About 30 metals exhibit temperature polymorphism, including iron, tin, cobalt, manganese, and titanium. Iron, for example, has a body-centered cubic crystal structure at low temperatures. This structure is called α-iron. However, at temperatures above 911 °C, the atoms rearrange to form a face-centered cubic crystal structure. This modification is called γ-iron.