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How are crystalline solids different from amorphous solids?
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Figure 1: Data in the table of the Galileo experiment. The tangent to the curve is drawn at t = 0.6.
The primary distinction between crystalline and amorphous solids lies in their atomic-scale structure.1
- Crystalline Solids: These materials possess long-range order, meaning their atoms are arranged in a regular, repeating translational periodicity throughout the structure. Because of this highly ordered lattice, crystalline solids have a characteristic melting point.2134
- Amorphous Solids: Also known as glasses or noncrystalline solids, these materials lack long-range order. While they do exhibit short-range order—where atoms maintain specific distances to their nearest neighbors due to chemical bonding—they do not have a definite, repeating lattice pattern. Consequently, amorphous solids typically melt over a range of temperatures rather than at a single, sharp melting point.214
While the term "amorphous" literally means "without form," it is technically a misnomer because these solids do maintain a structured atomic arrangement at the local level. Most amorphous solids are created through the rapid cooling of a melt, a process that bypasses the formation of a crystalline structure.12