Allotropy

Ability of a single substance to exist in more than one physical form.

Examples

Iron

• (Ferrite) - Below
• (Austenite) - Between and
• - Above
• (Hexaferrum)

First 3 exist in atmospheric pressure. Forth one exists in very high pressure.

Note

is the paramagnetic form of .

Carbon

• Graphite
• Diamond
• Carbon nanotubes

Buckminsterfullerene

Aka. bucky ball. Has atoms inside a molecule. A molecule is truncated icosahedron shaped. Diameter of the molecule is approx. . Each carbon atom is bonded to another 3. Not chemically inert.