fccderived

fccderived is a term used in materials science and computational physics to refer to quantities, properties, or descriptors that are derived from the face-centered cubic (FCC) crystal structure. It is not a universally standard variable, but appears in discussions, datasets, and model descriptions to emphasize that a value rests on FCC symmetry assumptions.

In practice, fccderived quantities are obtained by applying the symmetry constraints of the cubic FCC lattice, which reduces the number of independent parameters and channels the calculation through the basis of the lattice. Common examples include elastic constants derived from first-principles calculations (such as C11, C12, C44-based moduli), phonon properties inferred from lattice dynamics, and thermodynamic properties computed from FCC-derived models.

In computational workflows, fccderived values may be produced by fitting ab initio data to symmetry-allowed forms, or by analytical reduction from more general models to the FCC subspace. The concept is often used to distinguish results that rely on an ideal FCC assumption from those that include defects, alloying, or other lower-symmetry effects.

Applications include the study of metals with a predominantly FCC structure, such as aluminum, copper, and nickel, where rapid screening of properties is facilitated by FCC-derived descriptors.

Limitations include the exclusion of non-FCC phases, grain boundaries, and real-world imperfections. See also face-centered cubic lattice, elasticity theory, and lattice dynamics. The term appears mainly in technical discussions and datasets rather than formal nomenclature.