Beryllium sulfide

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Beryllium sulfide
Sphalerite polyhedra..png
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.680
EC Number 237-064-6
Properties
BeS
Molar mass 41.077 g/mol
Appearance white crystalline
Density 2.36 g/cm3
Melting point 1,800 °C (3,270 °F; 2,070 K) decomposes
Band gap 7.4 eV
1.741
Structure
cubic
Thermochemistry
34 J/mol K
34 J/mol K
-235 kJ/mol
Hazards
US health exposure limits (NIOSH):
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)[1]
REL (Recommended)
Ca C 0.0005 mg/m3 (as Be)[1]
IDLH (Immediate danger)
Ca [4 mg/m3 (as Be)][1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Beryllium sulfide (BeS) is an ionic compound from the sulfide group [2] with the formula BeS.

Preparation[edit]

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.

Alternatively, it can be prepared by the reaction of beryllium chloride and hydrogen sulfide at 1150 °C, though this reaction will leave chlorine impurities.

References[edit]