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Atomic Packing Factor

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Show that the atomic packing factor for HCP (Hexagonal close-packed) is 0.74.

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Here are som interesting sites you might want to check out:

http://members.iworld.net/joo/physics/curri-sub/crystal/lattice.html

http://er6s1.eng.ohio-state.edu/mse/mse205/lectures/chapter3/chap3.pdf

http://www.kings.edu/~chemlab/vrml/clospack.html

The Atomic Packing Factor is defined as the ratio between the volume of closely packed atoms and the volume of the unit cell.

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