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Polymers are also usually non-crystalline. Polymers are different from other materials
because they are not made of atoms, but long molecule chains. These chains can (and often
do) align into an orderly pattern, but this pattern is rarely as perfect as in atomically-bonded
materials like metals and ceramics. Polymers are usually considered “semicrystalline,”
although they can also be completely amorphous.
Figure 2.18: Glass atomic structure
Bravais Lattice
Bravais lattices are a way to describe a repeating arrangement of objects that fill a space.
Bravais lattices are the foundation for crystal structures. All other lattices can simplify into
one of the Bravais lattices. Bravais lattices move a specific basis by translation so that it lines
up to an identical basis. In 3 dimensions, there are 14 Bravais lattices, shows in Figure 2.19:
1. Simple Cubic
2. Face-Centered Cubic
3. Body-Centered Cubic
4. Hexagonal
5. Rhombohedral
6. Simple Tetragonal
7. Body-Centered Tetragonal
8. Simple Orthorhombic
9. Face-Centered Orthorhombic
10. Body-Centered Orthorhombic
11. Base-Centered Orthorhombic
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