Beryllium sulfide
In the Beryllium sulfide world, there is a great diversity of experiences, opinions and knowledge that contribute to enriching our understanding and perspectives on Beryllium sulfide. From different points of view and disciplines, Beryllium sulfide has been the object of interest and study, generating debates, advances and reflections that invite us to delve deeper into its meaning and impact on our lives. Throughout history, Beryllium sulfide has played a fundamental role in the way we relate to the world around us, influencing our beliefs, decisions and actions. In this article, we will explore various facets of Beryllium sulfide, examining its multiple dimensions and addressing key questions that will allow us to better understand its relevance today.
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| Identifiers | |
|---|---|
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.033.680 |
| EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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| 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 |
| Decomposes | |
| Band gap | 7.4 eV |
Refractive index (nD)
|
1.741 |
| Structure | |
| cubic | |
| F43m | |
| 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)
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TWA 0.002 mg/m3 C 0.005 mg/m3 (30 minutes), with a maximum peak of 0.025 mg/m3 (as Be) |
REL (Recommended)
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Ca C 0.0005 mg/m3 (as Be) |
IDLH (Immediate danger)
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Ca |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa).
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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.
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.
Alternatively, it can be prepared by the reaction of beryllium chloride and hydrogen sulfide at 900 °C.
References
- ^ Eugene Staritzky (1956). "Crystallographic Data. 121. Beryllium Sulfide, BeS". Analytical Chemistry. 28 (5): 915. doi:10.1021/ac60113a045.
- ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0054". National Institute for Occupational Safety and Health (NIOSH).
- ^ a b Kenneth A. Walsh (2009). Beryllium Chemistry and Processing. ASM International. p. 127. ISBN 978-087170721-5.
- ^ a b 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.
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