Chemistry:Lead(II) sulfide
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| Names | |
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| Other names
Plumbous sulfide
Galena, Sulphuret of lead | |
| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| EC Number |
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PubChem CID
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| RTECS number |
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| UNII | |
| UN number | 3077 |
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| Properties | |
| PbS | |
| Molar mass | 239.30 g/mol |
| Appearance | Black |
| Density | 7.60 g/cm3[1] |
| Melting point | 1,113[1] °C (2,035 °F; 1,386 K) |
| Boiling point | 1,281 °C (2,338 °F; 1,554 K) |
| 2.6×10−11 kg/kg (calculated, at pH=7)[2] 8.6×10−7 kg/kg[3] | |
| −83.6·10−6 cm3/mol[4] | |
Refractive index (nD)
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3.91[5] |
| Structure[7] | |
| Halite (cubic), cF8 | |
| Fm3m, No. 225 | |
a = 5.936 Å
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Formula units (Z)
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4 |
| Octahedral (Pb2+) Octahedral (S2−) | |
| 3.59 D[6] | |
| Thermochemistry[8] | |
Heat capacity (C)
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49.5 J/mol⋅K |
Std molar
entropy (S |
91.2 J/mol |
Std enthalpy of
formation (ΔfH⦵298) |
-100.4 kJ/mol |
Gibbs free energy (ΔfG˚)
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-98.7 kJ/mol |
| Hazards | |
| Safety data sheet | External MSDS |
| GHS pictograms |   
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| GHS Signal word | Danger |
| H302, H332, H360, H373, H410 | |
| P201, P202, P260, P261, P264, P270, P271, P273, P281, P301+312, P304+312, P304+340, P308+313, P312, P314, P330, P391, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Related compounds | |
Other anions
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Lead(II) oxide Lead selenide Lead telluride |
Other cations
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Carbon monosulfide Silicon monosulfide Germanium(II) sulfide Tin(II) sulfide |
Related compounds
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Thallium sulfide Lead(IV) sulfide Bismuth sulfide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is   ?)
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| Infobox references | |
Lead(II) sulfide (also spelled sulphide) is an inorganic compound with the formula PbS. Galena is the principal ore and the most important compound of lead. It is a semiconducting material with niche uses.
Addition of hydrogen sulfide or sulfide salts to a solution containing a lead salt, such as PbCl2, gives a black precipitate of lead sulfide.
- Pb2+ + H2S → PbS↓ + 2 H+
This reaction is used in qualitative inorganic analysis. The presence of hydrogen sulfide or sulfide ions may be tested using "lead acetate paper."
Like the related materials PbSe and PbTe, PbS is a semiconductor.[9] In fact, lead sulfide was one of the earliest materials to be used as a semiconductor.[10] Lead sulfide crystallizes in the sodium chloride motif, unlike many other IV-VI semiconductors.
Since PbS is the main ore of lead, much effort has focused on its conversion. A major process involves smelting of PbS followed by reduction of the resulting oxide. Idealized equations for these two steps are:[11]
- 2 PbS + 3 O2 → 2 PbO + 2 SO2
- PbO + C → Pb + CO
The sulfur dioxide is converted to sulfuric acid.
Nanoparticles
Lead sulfide-containing nanoparticle and quantum dots have been well studied.[12] Traditionally, such materials are produced by combining lead salts with a variety of sulfide sources.[13][14] In 2009, PbS nanoparticles have been examined for use in solar cells.[15]
Applications
Photodetector
PbS was one of the first materials used for electrical diodes that could detect electromagnetic radiation, including infrared light.[16] As an infrared sensor, PbS directly detects light, as opposed to thermal detectors, which respond to a change in detector element temperature caused by the radiation. A PbS element can be used to measure radiation in either of two ways: by measuring the tiny photocurrent the photons cause when they hit the PbS material, or by measuring the change in the material's electrical resistance that the photons cause. Measuring the resistance change is the more commonly used method. At room temperature, PbS is sensitive to radiation at wavelengths between approximately 1 and 2.5 μm. This range corresponds to the shorter wavelengths in the infra-red portion of the spectrum, the so-called short-wavelength infrared (SWIR). Only very hot objects emit radiation in these wavelengths.
Cooling the PbS elements, for example using liquid nitrogen or a Peltier element system, shifts its sensitivity range to between approximately 2 and 4 μm. Objects that emit radiation in these wavelengths still have to be quite hot—several hundred degrees Celsius—but not as hot as those detectable by uncooled sensors. (Other compounds used for this purpose include indium antimonide (InSb) and mercury-cadmium telluride (HgCdTe), which have somewhat better properties for detecting the longer IR wavelengths.) The high dielectric constant of PbS leads to relatively slow detectors (compared to silicon, germanium, InSb, or HgCdTe).
Planetary science
Elevations above 2.6 km (1.63 mi) on the planet Venus are coated with a shiny substance. Though the composition of this coat is not entirely certain, one theory is that Venus "snows" crystallized lead sulfide much as Earth snows frozen water. If this is the case, it would be the first time the substance was identified on a foreign planet. Other less likely candidates for Venus' "snow" are bismuth sulfide and tellurium.[17]
Safety
Lead(II) sulfide is so insoluble that it is almost nontoxic, but pyrolysis of the material, as in smelting, gives dangerous toxic fumes of lead and oxides of sulfur.[18] Lead sulfide is insoluble and a stable compound in the pH of blood and so is probably one of the less toxic forms of lead.[19] A large safety risk occurs in the synthesis of PbS using lead carboxylates, as they are particularly soluble and can cause negative physiological conditions.
References
- ↑ 1.0 1.1 Haynes, p. 4.69
- ↑ Linke, W. (1965). Solubilities. Inorganic and Metal-Organic Compounds. 2. Washington, D.C.: American Chemical Society. p. 1318.
- ↑ Ronald Eisler (2000). Handbook of Chemical Risk Assessment. CRC Press. ISBN 978-1-56670-506-6. https://books.google.com/books?id=cl1Kry_k6ZUC&pg=PA206.
- ↑ Haynes, p. 4.128
- ↑ Haynes, p. 4.135
- ↑ Haynes, p. 9.63
- ↑ Haynes, p. 4.141
- ↑ Haynes, p. 5.25
- ↑ Vaughan, D. J.; Craig, J. R. (1978). Mineral Chemistry of Metal Sulfides. Cambridge: Cambridge University Press. ISBN 978-0-521-21489-6.;
- ↑ Hogan, C. Michael (2011). "Sulfur". in Encyclopedia of Earth, eds. A. Jorgensen and C.J. Cleveland, National Council for Science and the environment, Washington DC.
- ↑ Sutherland, Charles A.; Milner, Edward F.; Kerby, Robert C.; Teindl, Herbert; Melin, Albert; Bolt, Hermann M. (2005). "Lead". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a15_193.pub2. ISBN 978-3527306732.
- ↑ "The Quantum Mechanics of Larger Semiconductor Clusters ("Quantum Dots")". Annual Review of Physical Chemistry 41 (1): 477–496. 1990-01-01. doi:10.1146/annurev.pc.41.100190.002401. Bibcode: 1990ARPC...41..477B.
- ↑ Zhou, H. S.; Honma, I.; Komiyama, H.; Haus, Joseph W. (2002-05-01). "Coated semiconductor nanoparticles; the cadmium sulfide/lead sulfide system's synthesis and properties" (in EN). The Journal of Physical Chemistry 97 (4): 895–901. doi:10.1021/j100106a015.
- ↑ Wang, Wenzhong; Liu, Yingkai; Zhan, Yongjie; Zheng, Changlin; Wang, Guanghou (2001-09-15). "A novel and simple one-step solid-state reaction for the synthesis of PbS nanoparticles in the presence of a suitable surfactant". Materials Research Bulletin 36 (11): 1977–1984. doi:10.1016/S0025-5408(01)00678-X.
- ↑ Lee, HyoJoong; Leventis, Henry C.; Moon, Soo-Jin; Chen, Peter; Ito, Seigo; Haque, Saif A.; Torres, Tomas; Nüesch, Frank et al. (2009-09-09). "PbS and CdS Quantum Dot-Sensitized Solid-State Solar Cells: "Old Concepts, New Results"" (in en). Advanced Functional Materials 19 (17): 2735–2742. doi:10.1002/adfm.200900081. ISSN 1616-3028.
- ↑ Putley, E H; Arthur, J B (1951). "Lead Sulphide – An Intrinsic Semiconductor". Proceedings of the Physical Society. Series B 64 (7): 616–618. doi:10.1088/0370-1301/64/7/110.
- ↑ "'Heavy metal' snow on Venus is lead sulfide". Washington University in St. Louis. http://news-info.wustl.edu/news/page/normal/633.html.
- ↑ "Lead sulfide MSDS". http://www.espimetals.com/msds%27s/leadsulfide.pdf.
- ↑ Bischoff, Fritz; Maxwell, L. C.; Evens, Richard D.; Nuzum, Franklin R. (1928). "Studies on the Toxicity of Various Lead Compounds Given Intravenously". Journal of Pharmacology and Experimental Therapeutics 34 (1): 85–109. https://jpet.aspetjournals.org/content/34/1/85.
Cited sources
- Haynes, William M., ed (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. ISBN 9781498754293.
External links
- Case Studies in Environmental Medicine (CSEM): Lead Toxicity
- ToxFAQs: Lead
- National Pollutant Inventory – Lead and Lead Compounds Fact Sheet
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