Page 91 - Materials Science and Engineering An Introduction

3.7 Crystal Systems • 63

Table 3.2 Lattice Parameter Relationships and Figures Showing Unit Cell Geometries for the
Seven Crystal Systems
Axial Unit
Crystal System Relationships Interaxial Angles Cell Geometry

Cubic a = b = c a = b = g = 90
: VMSE a a
Crystal Systems and a
Unit Cells for Metals

Hexagonal a = b c a = b = 90 , g = 120 c

a a a

Tetragonal a = b c a = b = g = 90
c
a
a

Rhombohedral a = b = c a = b = g 90
(Trigonal) a a a

Orthorhombic a b c a = b = g = 90
c
a
b

Monoclinic a b c a = g = 90 b
c

a
b

Triclinic a b c a b g 90 c

a
b