Materials Science 101
01
Structure
Chapter 03
Quiz
Atomic Packing Factor
Compare unit cell geometry of
SC
,
BCC
,
FCC
and
HCP
. Drag to rotate. Adjust atom size to reveal each close-packed direction.
SC
BCC
FCC
HCP
drag · rotate | wheel · zoom
Controls
Atom size (fraction of full r)
0.30
Show close-packed direction
Show unit cell edges
Crop atoms to cell
Show tetrahedron (for c/a derivation)
close-packed direction
tetrahedron
Simple Cubic
SC
Atoms per unit cell, n
1
a–r relation
a = 2r
Coordination number
6
Close-packed direction
Unit cell volume
a³
APF = 0.524
Derivation
×
Quiz · APF
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