Beryllium sulfide

Beryllium sulfide

Identifiers
CAS Number	13598-22-6
ChemSpider	44415277
EC Number	237-064-6
Jmol interactive 3D	Image
PubChem	83605
InChI InChI=1S/Be.S Key: FQDSYGKTHDFFCM-UHFFFAOYSA-N
SMILES [Be]=S
Properties
Chemical formula	BeS
Molar mass	41.077 g/mol
Appearance	white crystalline
Density	2.36 g/cm^3
Melting point	1,800 °C (3,270 °F; 2,070 K) decomposes
Band gap	7.4 eV
Refractive index (nD)	1.741
Structure
Crystal structure	cubic
Thermochemistry
Specific heat capacity (C)	34 J/mol K
Std molar entropy (S^o298)	34 J/mol K
Std enthalpy of formation (ΔfH^o298)	-235 kJ/mol
Hazards
US health exposure limits (NIOSH):
PEL (Permissible)	TWA 0.002 mg/m^3 C 0.005 mg/m^3 (30 minutes), with a maximum peak of 0.025 mg/m^3 (as Be)[1]
REL (Recommended)	Ca C 0.0005 mg/m^3 (as Be)[1]
IDLH (Immediate danger	Ca [4 mg/m^3 (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 is an ionic compound from the sulfide group ^[2] with the formula BeS.

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.

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

1. "NIOSH Pocket Guide to Chemical Hazards #0054". National Institute for Occupational Safety and Health (NIOSH).
2. Kenneth A. Walsh (2009). Beryllium Chemistry and Processing. ASM International. p. 127. ISBN 087170721-7.