At atmospheric pressure, there are three allotropic forms of iron, known as α, γ at high pressure, a fourth form exists, called ε.
There are three allotropic forms of iron, a fourth form exists. This is at atmospheric pressure. Iron is known as α. Iron is γ at high pressure. There are three allotropic forms of iron, a fourth form called ε. This was at atmospheric pressure. Iron was known as α. Iron was γ at high pressure.