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How do crystalline solids differ from amorphous solids such as glass?
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crystal
A crystal form of elemental sulfur. Sulfur has an atomic weight of about 32.06 atomic mass units (amu), which means that its molar mass is 32.06 grams.
The primary distinction between crystalline and amorphous solids lies in their atomic-scale structure, specifically regarding long-range order.12
- Crystalline Solids: These materials exhibit both short-range and long-range order. Their atoms are organized in a regular, repeating lattice pattern known as translational periodicity, meaning the atomic positions repeat precisely throughout the structure.12
- Amorphous Solids: Often referred to as glasses, these solids possess short-range order—where atoms maintain specific distances to their nearest neighbors due to chemical bonding—but they lack long-range order. Their atomic structure does not repeat in a definite, periodic array.123
While the term "amorphous" literally means "without form," it is technically a misnomer because these materials do possess a defined atomic-scale structure. Amorphous solids are typically formed through the rapid cooling of a melt, which bypasses the freezing point and prevents the formation of a crystalline lattice. Unlike liquids, both crystalline and amorphous materials are bona fide solids that exhibit elastic stiffness against shear stress.23