Ξ±-form of iron exists in BCC form and Ξ³-form of iron exists in FCC structure. Assuming that the dist β Solid State Chemistry Question
Question
Ξ±-form of iron exists in BCC form and Ξ³-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 Ξ³-form to that of Ξ±-form is
Answer: A
π‘ Solution & Explanation
If closest contact d is equal: a_BCC = 2d/β(3), a_FCC = d*β(2). Density ratio = (Z_FCC/Z_BCC)*(a_BCC/a_FCC)^3 = (4/2)*(β(2)/β(3))^3*... = 4*β(2) : 3*β(3).
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