![]() ![]() Ullmann's Encyclopedia of Industrial Chemistry. Hermann Wagner, Heinz Winkler, Jochen Wolf, Hans Uwe (2007). ^ Kresse, Robert Baudis, Ulrich Jäger, Paul Riechers, H.Licetus, Litheosphorus, sive de lapide Bononiensi lucem in se conceptam ab ambiente claro mox in tenebris mire conservante, Utini, ex typ. ![]() "Optical and electrical properties of II-VI wide gap semiconducting barium sulfide" Proceedings of SPIE (1992), 1523 (Conf. "Inorganic Chemistry" Academic Press: San Diego, 2001. CRC Handbook of Chemistry and Physics (87th ed.). Safety īaS is quite poisonous, as are related sulfides, such as CaS, which evolve toxic hydrogen sulfide upon contact with water. The observed melting point of barium sulfide is highly sensitive to impurities. īaS crystallizes with the NaCl structure, featuring octahedral Ba 2+ and S 2− centres. The phosphorescence of the material obtained by Casciarolo made it a curiosity. After grinding and heating the mineral with charcoal under reducing conditions, he obtained a persistent luminescent material rapidly called Lapis Boloniensis, or Bolognian stone. Īccording to Harvey (1957), in 1603, Vincenzo Cascariolo used barite, found at the bottom of Mount Paterno near Bologna, in one of his non-fruitful attempts to produce gold. These aqueous solutions, when treated with sodium carbonate or carbon dioxide, give a white solid of barium carbonate, a source material for many commercial barium compounds. This kind of conversion is called a carbothermic reaction: It is currently manufactured by an improved version of Casciarolus's process using coke in place of flour and charcoal. It is colorless, although like many sulfides, it is commonly obtained in impure colored forms.ĭiscovery, production and properties īaS was prepared by the Italian alchemist Vincentius (or Vincentinus) Casciarolus (or Casciorolus, 1571–1624) via the thermo-chemical reduction of BaSO 4 (available as the mineral barite). Like other chalcogenides of the alkaline earth metals, BaS is a short wavelength emitter for electronic displays. It is an important precursor to other barium compounds including BaCO 3 and the pigment lithopone, ZnS/BaSO 4. BaS is the barium compound produced on the largest scale. Barium sulfide is the inorganic compound with the formula Ba S. ![]()
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