Beryllium sulfide

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

Beryllium sulfide

Identifiers
CAS Number	13598-22-6
3D model (JSmol)	Interactive image
ChemSpider	44415277
ECHA InfoCard	100.033.680
EC Number	237-064-6
PubChem CID	83605
CompTox Dashboard (EPA)	DTXSID1065556
InChI InChI=1S/Be.S Key: FQDSYGKTHDFFCM-UHFFFAOYSA-N
SMILES [Be+2].[S-2]
Properties
Chemical formula	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
Solubility in water	Decomposes
Band gap	7.4 eV
Refractive index (nD)	1.741
Structure
Crystal structure	cubic
Space group	F43m[1]
Thermochemistry
Heat capacity (C)	34 J/mol K
Std molar entropy (S⦵298)	34 J/mol K
Std enthalpy of formation (ΔfH⦵298)	−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). Infobox references

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]