Barium sulfide
| Barium sulfide | |
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| Identifiers | |
| CAS number | 21109-95-5  |
| PubChem | 6857597 |
| ChemSpider | 5256933 |
| EC number | 244-214-4 |
| ChEBI | CHEBI:32590 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | BaS |
| Molar mass | 169.39 g/mol |
| Density | 4.25 g/cm3 [1] |
| Melting point |
1200 °C |
| Boiling point |
decomposes |
| Solubility in water | 2.88 g/cm3 (0 °C) 7.68 g/cm3 (20 °C) 60.3 g/100 mL (100 °C) |
| Solubility | insoluble in alcohol |
| Refractive index (nD) | 2.155 |
| Structure | |
| Crystal structure | Halite (cubic), cF8 |
| Space group | Fm3m, No. 225 |
| Coordination geometry |
Octahedral (Ba2+); octahedral (S2–) |
| Hazards | |
| EU Index | 016-002-00-X |
| EU classification | Harmful (Xn) Dangerous for the environment (N) |
| R-phrases | R20/22, R31, R50 |
| S-phrases | (S2), S28, S61 |
| NFPA 704 |
 3
2
0
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| Related compounds | |
| Other anions | Barium oxide |
| Other cations | Magnesium sulfide Calcium sulfide Strontium sulfide |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Barium sulfide is the inorganic compound with the formula BaS. BaS is an important precursor to other barium compounds including BaCO3 and the pigment lithopone, ZnS/BaSO4.[2] Like other chalcogenides of the alkaline earth metals, BaS is a short wavelength emitters for electronic displays.[3] It is colorless, although like many sulfides, it is commonly obtained in impure colored forms.
[edit] Discovery, production, properties
The BaS was prepared by Vincentius (or Vincentinus) Casciarolus (or Casciorolus, 1571-1624) via reduction of BaSO4 (available as the mineral barite).[4] It is currently manufactured by an improved version of Casciarolus's route using coke in place of flour. This kind of conversion is called a carbothermic reaction:
- BaSO4 + 2 C → BaS + 2 CO2
The phosphorescence of the substance made the material a curiosity and various alchemists and chemists made experiments with the material which was known as Lapis Boloniensis, Chrysolapis or bologna stone.[5][6][7]
Andreas Sigismund Marggraf showed that calcite and gypsum were not very suitable for the production of the bologna stone, but a special heavy fluorspar, in the end he concluded that calcium sulfate is the material from which the bologna stone is made.[8]
BaS crystallizes with the NaCl structure, featuring octahedral Ba2+ and S2- centres.
[edit] Safety
BaS is quite poisonous, as are related sulfides, such as CaS, which evolve toxic hydrogen sulfide upon contact with water.
[edit] References
- ^ Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
- ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
- ^ Vij, D. R.; Singh, N. "Optical and electrical properties of II-VI wide gap semiconducting barium sulfide" Proceedings of SPIE (1992), 1523 (Conf. Phys. Technol. Semicond. Devices Integr. Circuits, 1992), 608-12.
- ^ F. Licetus, Litheosphorus, sive de lapide Bononiensi lucem in se conceptam ab ambiente claro mox in tenebris mire conservante, Utini, ex typ. N. Schiratti, 1640. See http://www.chem.leeds.ac.uk/delights/texts/Demonstration_21.htm
- ^ "Lapis Boloniensis". www.zeno.org. http://www.zeno.org/Lemery-1721/A/Lapis+Boloniensis.
- ^ Lemery, Nicolas (1714). Trait℗e universel des drogues simples. http://books.google.de/books?id=K25AAAAAcAAJ&pg=PA458#v=onepage&q&f=false.
- ^ Ozanam, Jacques; Montucla, Jean Etienne; Hutton, Charles (1814). Recreations in mathematics and natural philosophy ... http://books.google.de/books?id=jAYAAAAAQAAJ&pg=PA411.
- ^ Marggraf, Andreas Sigismund (1767). Chymische Schriften. http://books.google.de/books?id=Obc5AAAAcAAJ&pg=PA113.
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