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Unit Cells (Simple (a = 2R, Coord # = 6, APF = Pi / 6 (0.54)), Face…
Unit Cells
Simple
a = 2R
Coord # = 6
APF = Pi / 6 (0.54)
Face Centered
Coord # = 12
a = 2sqrt(2)R
APF = 0.74
Body Centered
a = 4R/sqrt(3)
Coordination # = 8
APF = 0.68
Terms
Lattice Constant
Length of each side in a unit cell
Coordination #
number of atoms an atom touches
Atomic Packing Factor (APF)
Volume Atoms/Volume Cell
(4/3
pi
R^3) / (lattice constant)^3
AX Structure
Cesium Chloride
Coord # = 8
Looks kinda like a BCC
Zinc Blende
Coord # = 4
Looks like a jumbled mess
Sodium Chloride (Rock Salt
Looks like several unit cells