VITEEE 2017 Paper

Iron crystallizes in several modifications. At about 911 °C, the bcc ’ a ’ form undergoes a trasition to fcc ’ γ ’ form. If the distance between the two nearest neighbours is the same in the two forms at the transition temperature, the ratio of the density of iron in fee form (ρ2) to that of iron of bcc form (ρ2) at the transition temperature