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Joined 2026-09-21 Message
Lars Vegard Created 2026-10-20 Updated 2026-11-05
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.
