Strukturbericht

Strukturbericht refers to a historical system used to classify crystal structures of inorganic solids, especially metallic alloys. Developed and popularized in the Strukturbericht (Structure Reports) series, the designation aimed to provide a concise way to reference known prototype structures and to compare newly observed arrangements with established ones. Each structure type is assigned a code consisting of a letter or combination of letters followed by a number, such as A1, B2, or C36. The letter denotes a general structure family, while the number identifies a specific prototype. The codes describe the atomic arrangement and lattice relationships rather than the exact chemical composition, and a single prototype can accommodate multiple compounds with varying stoichiometry.

Usage and scope: The Strukturbericht system served as a practical shorthand for discussing and cataloging crystal structures and phase relations in metallic systems. It was widely used in mid- to late-20th-century literature, data compilations, and educational materials, providing a common reference framework for crystallographers and metallurgists.

Limitations and current status: Today the Strukturbericht designations are largely superseded by more explicit crystallographic descriptors, such as space-group notation, Pearson symbols, and modern prototype databases. Limitations include potential ambiguity when a code covers more than one composition, changes in structure with temperature or composition, and reduced applicability to complex or disordered materials.

See also: Structure Report series, crystallography, materials science databases.