Disordered materials

             Crystalline vs. Amorphous

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Crystalline solids exhibit translational symmetry (periodicity of atomic positions, unit cell)

Amorphous (glassy, or non-crystalline solids) are lack of long-range order: short-range order exists

Types of disordered solid materials

Amorphous solids

Many thin films: semiconductor, metals...

Glasses (supercooled liquids): Vitrious silica, Oxide glasses, Chalcogenide glasses

Composites: Random alloys, Metal-insulator mixtures, Porous materials

Often exhibit fractal structure at intermediate length scales

                                                                                                                        source: G. A. Niklasson