To use all functions of this page, please activate cookies in your browser.
With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter.
- My watch list
- My saved searches
- My saved topics
- My newsletter
Barium sulfide is the chemical compound with the formula BaS. This material was once known as "Bologna Stone", the first synthetic phosphor. Currently the chalcogenides of the alkaline earth metals are intensely studied as candidates for short wavelength emitters for electronic displays. BaS is considered to be the most important synthetic material of barium, being the precursor to BaCO3 and the pigment lithopone.
Additional recommended knowledge
Discovery, production, properties
The BaS was prepared by Vincentius (or Vincentinus) Casciarolus (or Casciorolus, 1571-1624) via a crude version of what is now known as a "carbothermic reduction", employing flour in place of carbon:
BaSO4 is available as the common mineral barite.
BaS, m.p. 1200 °C, crystallizes with the NaCl structure and is currently manufactured by an improved version of Casciarolus's route: using coke in place of flour. It is colorless, although like many sulfides, it is commonly obtained in impure colored forms.
BaS is quite poisonous, as are related sulfides, such as CaS, which evolve toxic hydrogen sulfide upon contact with water. The particular problem with BaS is that its name resembles that of the insoluble, non-toxic material given in large doses to some medical patients. Switching BaS for BaSO4 is lethal.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Barium_sulfide". A list of authors is available in Wikipedia.|