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What is the atomic packing factor of BCC structure?

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What is the atomic packing factor of BCC structure?

(a) 0.54

(b) 0.68

(c) 0.74

(d) 0.96

I got this question by my school principal while I was bunking the class.

This interesting question is from Types of Solids, Crystal Structures and Lattices in portion Solid Solutions & Crystallography of Engineering Material & Metallurgy

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Correct choice is (b) 0.68

Easy explanation: The density of packing in a crystal is determined using the atomic packing factor (APF). The APF of FCC and HCP structures is 0.74, and 0.54 for simple cubic structure, whereas it is 0.68 for BCC structure.

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