α-form of iron exists in BCC form and γ-form of iron exists in FCC structure. Assuming that the dist — Solid State Chemistry Question
Question
α-form of iron exists in BCC form and γ-form of iron exists in FCC structure. Assuming that the distance between the nearest neighbours is the same in the two forms, the ratio of the density of γ-form to that of α-form is
Answer: A
💡 Solution & Explanation
If closest contact d is equal: a_BCC = 2d/√(3), a_FCC = d*√(2). Density ratio = (Z_FCC/Z_BCC)*(a_BCC/a_FCC)^3 = (4/2)*(√(2)/√(3))^3*... = 4*√(2) : 3*√(3).
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