Mercury selenide
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| Names | |
|---|---|
| IUPAC name
Mercury selenide
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| Identifiers | |
20601-83-6  |
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| PubChem | 88609 |
| Properties | |
| HgSe | |
| Molar mass | 279.55 g/mol |
| Appearance | grey-black solid |
| Density | 8.3 g/cm3 |
| Melting point | 1,000 °C; 1,830 °F; 1,270 K |
| insoluble | |
| Structure | |
| sphalerite | |
| Thermochemistry | |
| 178 J kg−1 K−1 | |
|
Std enthalpy of
formation (ΔfH |
247 kJ/mol |
| Vapor pressure | {{{value}}} |
| Related compounds | |
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Other anions
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Mercury oxide Mercury sulfide Mercury telluride |
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Other cations
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Zinc selenide Cadmium selenide |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Mercury selenide (HgSe) is a chemical compound of mercury and selenium. It is a grey-black crystalline solid semi-metal with a sphalerite structure. The lattice constant is 0.608 nm.
Mercury selenide can also refer to the following chemical compounds: HgSe2 and HgSe8. HgSe is strictly mercury(II) selenide.
HgSe occurs naturally as the mineral Tiemannite.
Along with other II-VI compounds, colloidal nanocrystals of HgSe can be formed.
Applications
- Selenium is used in filters in some steel plants to remove mercury from exhaust gases. The solid product formed is HgSe.
- HgSe can be used as an ohmic contact to wide-gap II-VI semiconductors such as zinc selenide or zinc oxide.
Toxicity
HgSe is non-toxic so long as it is not ingested due to its insolubility. Toxic hydrogen selenide fumes can be evolved on exposure to acids. HgSe is a relatively stable compound which might mean that it is less toxic than elemental mercury or many organometallic mercury compounds. Selenium's ability to complex with mercury has been proposed as a reason for the lack of mercury toxicity in deep sea fish despite high mercury levels.[1]
See also
References
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- SNV (1991) Guidelines on measures and methods for heavy metal emissions control. Solna, The Swedish Environmental Protection Agency – Naturvårdsverket.
