Beryllium sulfide

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Beryllium sulfide
Sphalerite polyhedra.png
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.680 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 237-064-6
PubChem CID
  • InChI=1S/Be.S
    Key: FQDSYGKTHDFFCM-UHFFFAOYSA-N
  • [Be+2].[S-2]
Properties
BeS
Molar mass 41.077 g/mol
Appearancewhite crystalline
Density 2.36 g/cm3
Melting point 1,800 °C (3,270 °F; 2,070 K) decomposes
Decomposes
Band gap 7.4 eV
1.741
Structure
cubic
F43m [1]
Thermochemistry
34 J/mol K
Std molar
entropy
(S298)
34 J/mol K
-235 kJ/mol
Hazards
NIOSH (US health exposure limits):
PEL (Permissible)
TWA 0.002 mg/m3
C 0.005 mg/m3 (30 minutes), with a maximum peak of 0.025 mg/m3 (as Be) [2]
REL (Recommended)
Ca C 0.0005 mg/m3 (as Be) [2]
IDLH (Immediate danger)
Ca [4 mg/m3 (as Be)] [2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Beryllium sulfide (BeS) is an ionic compound from the sulfide group with the formula Be S. It is a white solid with a sphalerite structure that is decomposed by water and acids. [3]

Preparation

Beryllium sulfide powders can be prepared by the reaction of sulfur and beryllium in a hydrogen atmosphere by heating the mixture for 10-20 minutes at temperatures from 1000-1300 °C. If done at 900 °C, there is beryllium metal impurities. [4]

Alternatively, it can be prepared by the reaction of beryllium chloride and hydrogen sulfide at 900 °C. [3] [4]

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References

  1. Eugene Staritzky (1956). "Crystallographic Data. 121. Beryllium Sulfide, BeS". Analytical Chemistry. 28 (5): 915. doi:10.1021/ac60113a045.
  2. 1 2 3 NIOSH Pocket Guide to Chemical Hazards. "#0054". National Institute for Occupational Safety and Health (NIOSH).
  3. 1 2 Kenneth A. Walsh (2009). Beryllium Chemistry and Processing. ASM International. p. 127. ISBN   978-087170721-5.
  4. 1 2 William Zachariasen (1926). "Die Kristallstrunkturen von Berylliumoxyd und Berylliumsulfid" [The crystal structures of beryllium oxide and beryllium sulfide]. Zeitschrift für Physikalische Chemie (in German). 119U (1): 201–213. doi:10.1515/zpch-1926-11921. S2CID   99383696.