Boron, arsenic, and antimony, among other substances, are used as dopants when added to a pure semiconductor material to alter its electrical characteristics.
Artificially produced gemstones[?] (such as Ruby (gemstone)) usually contain a dopant to identify them as such.
... Ferdinand in 1516, Charles became joint-king of Castile with his mother (who was insane), and also inherited Aragon, Navarre, Granada, Naples, Sicily, Sardinia, and ...