GATE ME 2015 Set 2 — Question 30
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Engineering Materials → Structure & Properties → Crystal Structures & Imperfections
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Question
The atomic packing factor for a material with body centered cubic structure is ________
Correct answer
0.66 to 0.69
Solution
The Atomic Packing Factor (APF) is the fraction of volume in a crystal structure that is occupied by constituent particles.For a Body-Centered Cubic (BCC) structure:
1.Number of atoms per unit cell () = 2.
2.Relation between atomic radius () and lattice constant (): .
3.Volume of atoms in unit cell = .
4.Volume of unit cell = .
5.APF = .
The value 0.68 falls within the range 0.66 to 0.69.Continue learning with Success Tracker
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