Why do metals exhibit a predefined crystal structure?

Mohammad Hossein Mosallanejad @Mohammad-Mosallanejad

11 October 2017 1 1K Report

I would like to know why metals exhibit a predefined crystal structure. In other words, why Copper is in form of FCC or Fe is a BCC metal and so on.

I know that these structures are formed to maintain the equilibrium atomic spacing, but how is it that the "equilibrium atomic spacing" is achieved when a special structure (FCC, BCC and etc) is formed?

Ashutosh Pandey

The structure of metals change with pressure and temperature. For an example, iron exists as a body-centered cubic structure at standard pressure and temperature but when temperature exceeds a certain threshold, atoms are tighter packed and the structure changes to face-centered cubic.

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