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.
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Jordanes
Jordanes or Jordanis was a 6th century historian. He was an Ostrogoth and was a notary of Gothic kings in Italy. At the time of Justinian, ...