Lars Vegard is a name associated with a concept in materials science known as the Vegard's Law. This law describes the linear relationship between the composition of an alloy and its lattice constants, which is significant in understanding the physical properties of solid solutions. Specifically, Vegard's Law states that the lattice parameter of a solid solution can be calculated as a weighted average of the lattice parameters of the constituent pure components.
Articles by others on the same topic
Lars Vegard investigated the structure of mixed crystals and the relation now called Vegard's law. For a suitable single-phase solid solution at fixed temperature, its lattice parameter can be approximated by a composition-weighted interpolation between the end members. A measured diffraction spacing can thus provide information about composition. The rule is empirical: ordering, strain and nonideal mixing can produce departures, so a straight-line calibration is a model to test rather than a universal theorem.[ref]
Die Konstitution der Mischkristalle und die Raumfüllung der Atome by Lars Vegard. Zeitschrift für Physik 5, 17–26 (1921), mixed-crystal investigation
Portrait of Lars Vegard
. Narve Skarpmoen; National Library of Norway (Nasjonalbiblioteket); 1920–1930. Public domain in Norway (PD-Norway50 photograph). Source usage terms, via Wikimedia Commons. Source.
