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Osmium (from Greek ὀσμή osme, "smell") is a chemical element with symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest naturally occurring element, with a density of 7004225900000000000♠22.59 g/cm3. Its alloys with platinum, iridium, and other platinum-group metals are employed in fountain pen nibs, electrical contacts, and other applications where extreme durability and hardness are needed.
Osmium has a blue-gray tint and is the densest stable element, slightly denser than iridium. Calculations of density from the X-ray diffraction data may produce the most reliable data for these elements, giving a value of 7004225620000000000♠22.562±0.009 g/cm3 for iridium versus 7004225870000000000♠22.587±0.009 g/cm3 for osmium.
Osmium is a hard but brittle metal that remains lustrous even at high temperatures. It has a very low compressibility. Correspondingly, its bulk modulus is extremely high, reported between 7002395000000000000♠395 and 7011462000000000000♠462 GPa, which rivals that of diamond (7011443000000000000♠443 GPa). The hardness of osmium is moderately high at 7009400000000000000♠4 GPa. Because of its hardness, brittleness, low vapor pressure (the lowest of the platinum-group metals), and very high melting point (the fourth highest of all elements), solid osmium is difficult to machine, form, or work.
Os. However, the most notable application of Os isotopes in geology has been in conjunction with the abundance of iridium, to characterise the layer of shocked quartz along the Cretaceous–Paleogene boundary that marks the extinction of the dinosaurs 66 million years ago.
Osmium was discovered in 1803 by Smithson Tennant and William Hyde Wollaston in London, England. The discovery of osmium is intertwined with that of platinum and the other metals of the platinum group. Platinum reached Europe as platina ("small silver"), first encountered in the late 17th century in silver mines around the Chocó Department, in Colombia. The discovery that this metal was not an alloy, but a distinct new element, was published in 1748. Chemists who studied platinum dissolved it in aqua regia (a mixture of hydrochloric and nitric acids) to create soluble salts. They always observed a small amount of a dark, insoluble residue. Joseph Louis Proust thought that the residue was graphite. Victor Collet-Descotils, Antoine François, comte de Fourcroy, and Louis Nicolas Vauquelin also observed the black residue in 1803, but did not obtain enough material for further experiments.
In 1803, Smithson Tennant analyzed the insoluble residue and concluded that it must contain a new metal. Vauquelin treated the powder alternately with alkali and acids and obtained a volatile new oxide, which he believed to be of this new metal—which he named ptene, from the Greek word πτηνος (ptènos) for winged. However, Tennant, who had the advantage of a much larger amount of residue, continued his research and identified two previously undiscovered elements in the black residue, iridium and osmium. He obtained a yellow solution (probably of cis–[Os(OH)2O4]2−) by reactions with sodium hydroxide at red heat. After acidification he was able to distill the formed OsO4. He named it osmium after Greek osme meaning "a smell", because of the ashy and smoky smell of the volatile osmium tetroxide. Discovery of the new elements was documented in a letter to the Royal Society on June 21, 1804.
Osmium is the least abundant stable element in Earth's crust with an average mass fraction of 50 parts per trillion in the continental crust.
Neither the producers nor the United States Geological Survey published any production amounts for osmium. Estimations of the United States consumption date published from 1971, which gives a consumption in the United States of 2000 troy ounces (62 kg), would suggest that the production is still less than 1 ton per year. In 2012, the estimated US production of osmium was 75 kg.
Because of the volatility and extreme toxicity of its oxide, osmium is rarely used in its pure state, but is instead often alloyed with other metals. Those alloys are utilized in high-wear applications. Osmium alloys such as osmiridium are very hard and, along with other platinum-group metals, are used in the tips of fountain pens, instrument pivots, and electrical contacts, as they can resist wear from frequent operation. They were also used for the tips of phonograph styli during the late 78 rpm and early "LP" and "45" record era, circa 1945 to 1955. Although very durable compared to steel and chromium needle points, osmium-alloy tips wore out far more rapidly than competing but costlier sapphire and diamond tips and were discontinued.
Osmium tetroxide has been used in fingerprint detection and in staining fatty tissue for optical and electron microscopy. As a strong oxidant, it cross-links lipids mainly by reacting with unsaturated carbon–carbon bonds and thereby both fixes biological membranes in place in tissue samples and simultaneously stains them. Because osmium atoms are extremely electron-dense, osmium staining greatly enhances image contrast in transmission electron microscopy (TEM) studies of biological materials. Those carbon materials have otherwise very weak TEM contrast (see image). Another osmium compound, osmium ferricyanide (OsFeCN), exhibits similar fixing and staining action.
The tetroxide and a related compound potassium osmate are important oxidants for chemical synthesis, despite being very poisonous. For the Sharpless asymmetric dihydroxylation, which uses osmate for the conversion of a double bond into a vicinal diol, Karl Barry Sharpless won the Nobel Prize in Chemistry in 2001. OsO4 is very expensive for this use, so KMnO4 is often used instead, even though the yields are less for this cheaper chemical reagent.
In 1898 an Austrian chemist Auer von Welsbach developed the Oslamp with a filament made of osmium, which he introduced commercially in 1902. After only a few years, osmium was replaced by the more stable metal tungsten. Tungsten has the highest melting point among all metals, and using it in light bulbs increases the luminous efficacy and life of incandescent lamps.
The only known clinical use of osmium appears to be for synovectomy in arthritic patients in Scandinavia. It involves the local administration of osmium tetroxide (OsO4), which is a highly toxic compound. The lack of reports of long-term side effects suggest that osmium itself can be biocompatible, although this depends on the osmium compound administered. In 2011, osmium(VI) and osmium(II) compounds were reported to show anticancer activity in vivo, it indicated a promising future for using osmium compounds as anticancer drugs.
Finely divided metallic osmium is pyrophoric and reacts with oxygen at room temperature, forming volatile osmium tetroxide. Some osmium compounds are also converted to the tetroxide if oxygen is present. This makes osmium tetroxide the main source of contact with the environment.
Osmium tetroxide is highly volatile and penetrates skin readily, and is very toxic by inhalation, ingestion, and skin contact. Airborne low concentrations of osmium tetroxide vapor can cause lung congestion and skin or eye damage, and should therefore be used in a fume hood. Osmium tetroxide is rapidly reduced to relatively inert compounds by polyunsaturated vegetable oils, such as corn oil.
Osmium is usually sold as a minimum 99.9% pure powder. Like other precious metals, it is measured by troy weight and by grams. Its price in 2012 was about $400 per troy ounce (or about $13,000 per kilogram), depending on the quantity and its supplier.
Lide, D. R., ed. (2005). "Magnetic susceptibility of the elements and inorganic compounds". CRC Handbook of Chemistry and Physics (PDF) (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
Hammond "Osmium", C. R., p. 4–25 in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.
Arblaster, J. W. (1989). "Densities of osmium and iridium: recalculations based upon a review of the latest crystallographic data" (PDF). Platinum Metals Review. 33 (1): 14–16.
Arblaster, J. W. (1995). "Osmium, the Densest Metal Known". Platinum Metals Review. 39 (4): 164.
Weinberger, Michelle; Tolbert, Sarah; Kavner, Abby (2008). "Osmium Metal Studied under High Pressure and Nonhydrostatic Stress". Phys. Rev. Lett. 100 (4): 045506. Bibcode:2008PhRvL.100d5506W. doi:10.1103/PhysRevLett.100.045506. PMID 18352299.
Cynn, Hyunchae; Klepeis, J. E.; Yeo, C. S.; Young, D. A. (2002). "Osmium has the Lowest Experimentally Determined Compressibility". Physical Review Letters. 88 (13): 135701. Bibcode:2002PhRvL..88m5701C. doi:10.1103/PhysRevLett.88.135701. PMID 11955108.
Sahu, B. R.; Kleinman, L. (2005). "Osmium Is Not Harder Than Diamond". Physical Review B. 72 (11): 113106. Bibcode:2005PhRvB..72k3106S. doi:10.1103/PhysRevB.72.113106.
"Iridium forms compound in +9 oxidation state".
Selig, H.; Claassen, H. H.; Chernick, C. L.; Malm, J. G.; et al. (1964). "Xenon tetroxide – Preparation + Some Properties". Science. 143 (3612): 1322–3. Bibcode:1964Sci...143.1322S. doi:10.1126/science.143.3612.1322. JSTOR 1713238. PMID 17799234.
Huston, J. L.; Studier, M. H.; Sloth, E. N. (1964). "Xenon tetroxide – Mass Spectrum". Science. 143 (3611): 1162–3. Bibcode:1964Sci...143.1161H. doi:10.1126/science.143.3611.1161-a. JSTOR 1712675. PMID 17833897.
Barnard, C. F. J. (2004). "Oxidation States of Ruthenium and Osmium". Platinum Metals Review. 48 (4): 157. doi:10.1595/147106704X10801.
"Chemistry of Hassium" (PDF). Gesellschaft für Schwerionenforschung mbH. 2002. Retrieved 2007-01-31.
Gong, Yu; Zhou, Mingfei; Kaupp, Martin; Riedel, Sebastian (2009). "Formation and Characterization of the Iridium Tetroxide Molecule with Iridium in the Oxidation State +VIII". Angewandte Chemie International Edition. 48 (42): 7879. doi:10.1002/anie.200902733.
Domanov, V. P.; Lobanov, Yu. V. (February 2009). "Refinement of data on the volatility of octavalent plutonium in the form of tetraoxide PuO4". Radiochemistry. SP MAIK Nauka/Interperiodica. 51 (1): 14–17. doi:10.1134/S1066362209010044.
Domanov, V. P. (January 2013). "Possibility of generation of octavalent curium in the gas phase in the form of volatile tetraoxide CmO4". Radiochemistry. SP MAIK Nauka/Interperiodica. 55 (1): 46–51. doi:10.1134/S1066362213010098.
Krause, J.; Siriwardane, Upali; Salupo, Terese A.; Wermer, Joseph R.; et al. (1993). "Preparation of [Os3(CO)11]2− and its reactions with Os3(CO)12; structures of [Et4N] [HOs3(CO)11] and H2OsS4(CO)". Journal of Organometallic Chemistry. 454: 263–271. doi:10.1016/0022-328X(93)83250-Y.
Carter, Willie J.; Kelland, John W.; Okrasinski, Stanley J.; Warner, Keith E.; et al. (1982). "Mononuclear hydrido alkyl carbonyl complexes of osmium and their polynuclear derivatives". Inorganic Chemistry. 21 (11): 3955–3960. doi:10.1021/ic00141a019.
Mager Stellman, J. (1998). "Osmium". Encyclopaedia of Occupational Health and Safety. International Labour Organization. p. 63.34. ISBN 978-92-2-109816-4. OCLC 35279504.
Holleman, A. F.; Wiberg, E.; Wiberg, N. (2001). Inorganic Chemistry (1st ed.). Academic Press. ISBN 0-12-352651-5. OCLC 47901436.
Griffith, W. P. (1965). "Osmium and its compounds". Quarterly Review of the Chemical Society. 19 (3): 254–273. doi:10.1039/QR9651900254.
Bozzola, John J.; Russell, Lonnie D. (1999). "Specimen Preparation for Transmission Electron Microscopy". Electron microscopy : principles and techniques for biologists. Sudbury, Mass.: Jones and Bartlett. pp. 21–31. ISBN 978-0-7637-0192-5.
Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements (2nd ed.). Oxford:Butterworth-Heinemann. pp. 1113–1143, 1294. ISBN 0-7506-3365-4. OCLC 213025882.
Gulliver, D. J; Levason, W. (1982). "The chemistry of ruthenium, osmium, rhodium, iridium, palladium and platinum in the higher oxidation states". Coordination Chemistry Reviews. 46: 1–127. doi:10.1016/0010-8545(82)85001-7.
Peter A. Lay; W. Dean Harman (1992). Advances in Inorganic Chemistry. A. G. Sykes. Academic Press. p. 221. ISBN 0-12-023637-0.
Hunt, L. B. (1987). "A History of Iridium" (PDF). Platinum Metals Review. 31 (1): 32–41. Retrieved 2012-03-15.
Dąbek, Józef; Halas, Stanislaw (2007). "Physical Foundations of Rhenium-Osmium Method – A Review". Geochronometria. 27: 23–26. doi:10.2478/v10003-007-0011-4.
Alvarez, L. W.; Alvarez, W.; Asaro, F.; Michel, H. V. (1980). "Extraterrestrial cause for the Cretaceous–Tertiary extinction". Science. 208 (4448): 1095–1108. Bibcode:1980Sci...208.1095A. doi:10.1126/science.208.4448.1095. PMID 17783054.
Venetskii, S. I. (1974). "Osmium". Metallurgist. 18 (2): 155–157. doi:10.1007/BF01132596.
McDonald, M. (959). "The Platinum of New Granada: Mining and Metallurgy in the Spanish Colonial Empire". Platinum Metals Review. 3 (4): 140–145.
Juan, J.; de Ulloa, A. (1748). Relación histórica del viage a la América Meridional (in Spanish). 1. p. 606.
Emsley, J. (2003). "Osmium". Nature's Building Blocks: An A-Z Guide to the Elements. Oxford, England, UK: Oxford University Press. pp. 199–201. ISBN 0-19-850340-7.
Griffith, W. P. (2004). "Bicentenary of Four Platinum Group Metals. Part II: Osmium and iridium – events surrounding their discoveries". Platinum Metals Review. 48 (4): 182–189. doi:10.1595/147106704X4844.
Thomson, T. (1831). A System of Chemistry of Inorganic Bodies. Baldwin & Cradock, London; and William Blackwood, Edinburgh. p. 693.
Weeks, M. E. (1968). Discovery of the Elements (7 ed.). Journal of Chemical Education. pp. 414–418. ISBN 0-8486-8579-2. OCLC 23991202.
Tennant, S. (1804). "On Two Metals, Found in the Black Powder Remaining after the Solution of Platina". Philosophical Transactions of the Royal Society. 94: 411–418. doi:10.1098/rstl.1804.0018. JSTOR 107152.
Smil, Vaclav (2004). Enriching the Earth: Fritz Haber, Carl Bosch, and the Transformation of World Food Production. MIT Press. pp. 80–86. ISBN 978-0-262-69313-4.
Wedepohl, Hans K (1995). "The composition of the continental crust". Geochimica et Cosmochimica Acta. 59 (7): 1217–1232. Bibcode:1995GeCoA..59.1217W. doi:10.1016/0016-7037(95)00038-2.
George, M. W. (2008). "Platinum-group metals" (PDF). U.S. Geological Survey Mineral Commodity Summaries. USGS Mineral Resources Program.
George, M. W. 2006 Minerals Yearbook: Platinum-Group Metals (PDF). United States Geological Survey USGS. Retrieved 2008-09-16.
Renner, H.; Schlamp, G.; Kleinwächter, I.; Drost, E.; et al. (2002). "Platinum group metals and compounds". Ullmann's Encyclopedia of Industrial Chemistry. Wiley. doi:10.1002/14356007.a21_075.
Hunt, L. B.; Lever, F. M. (1969). "Platinum Metals: A Survey of Productive Resources to industrial Uses" (PDF). Platinum Metals Review. 13 (4): 126–138. Retrieved 2008-10-02.
Smith, Ivan C.; Carson, Bonnie L.; Ferguson, Thomas L. (1974). "Osmium: An Appraisal of Environmental Exposure". Environmental Health Perspectives. 8: 201–213. doi:10.2307/3428200. JSTOR 3428200. PMC 1474945. PMID 4470919.
"PLATINUM-GROUP METALS" (PDF). USGS. Retrieved 27 May 2013.
Stephen D. Cramer & Bernard S. Covino, Jr. (2005). ASM Handbook Volume 13B. Corrosion: Materials. ASM International. ISBN 978-0-87170-707-9.
MacDonell, Herbert L. (1960). "The Use of Hydrogen Fluoride in the Development of Latent Fingerprints Found on Glass Surfaces". The Journal of Criminal Law, Criminology, and Police Science. 51 (4): 465–470. doi:10.2307/1140672. JSTOR 1140672.
Chadwick, D. (2002). Role of the sarcoplasmic reticulum in smooth muscle. John Wiley and Sons. pp. 259–264. ISBN 0-470-84479-5.
Kolb, H. C.; Van Nieuwenhze, M. S.; Sharpless, K. B. (1994). "Catalytic Asymmetric Dihydroxylation". Chemical Reviews. 94 (8): 2483–2547. doi:10.1021/cr00032a009.
Colacot, T. J. (2002). "2001 Nobel Prize in Chemistry" (PDF). Platinum Metals Review. 46 (2): 82–83.
Osmium tetroxide as a reagent in organic chemistry — Master Organic Chemistry. Masterorganicchemistry.com. Retrieved on 2012-12-07.
Bowers, B., B. (2001). "Scanning our past from London: the filament lamp and new materials". Proceedings of the IEEE. 89 (3): 413–415. doi:10.1109/5.915382.
Antonov, V. E.; Belash, I. T.; Malyshev, V. Yu.; Ponyatovsky, E. G. (1984). "The Solubility of Hydrogen in the Platinum Metals under High Pressure" (PDF). Platinum Metals Review. 28 (4): 158–163.
Torr, Marsha R. (1985). "Osmium coated diffraction grating in the Space Shuttle environment: performance". Applied Optics. 24 (18): 2959. Bibcode:1985ApOpt..24.2959T. doi:10.1364/AO.24.002959. PMID 18223987.
Gull, T. R.; Herzig, H; Osantowski, JF; Toft, AR (1985). "Low earth orbit environmental effects on osmium and related optical thin-film coatings". Applied Optics. 24 (16): 2660. Bibcode:1985ApOpt..24.2660G. doi:10.1364/AO.24.002660. PMID 18223936.
Sheppeard, H.; D. J. Ward (1980). "Intra-articular osmic acid in rheumatoid arthritis: five years' experience". Rheumatology. 19 (1): 25–29. doi:10.1093/rheumatology/19.1.25. PMID 7361025.
Lau, T.-C; W.-X. Ni; W.-L. Man; M. T.-W. Cheung; et al. (2011). "Osmium(vi) complexes as a new class of potential anti-cancer agents". Chem. Commun. 47 (7): 2140–2142. doi:10.1039/C0CC04515B.
Sadler, Peter; Steve D. Shnyder; Ying Fu; Abraha Habtemariam; et al. (2011). "Anti-colorectal cancer activity of an organometallic osmium arene azopyridine complex". Med. Chem. Commun. 2 (7): 666–668. doi:10.1039/C1MD00075F.
Fu, Ying; Romero, María J.; Habtemariam, Abraha; et al. (2012). "The contrasting chemical reactivity of potent isoelectronic iminopyridine and azopyridine osmium(II) arene anticancer complexes". Chemical Science. 3 (8): 2485–2494. doi:10.1039/C2SC20220D.
"Second LDEF post-retrieval symposium interim results of experiment A0034" (PDF). NASA. Retrieved 2009-06-06.
Linton, Roger C.; Kamenetzky, Rachel R.; Reynolds, John M.; Burris, Charles L. (1992). "LDEF experiment A0034: Atomic oxygen stimulated outgassing". In NASA. Langley Research Center. NASA: 763. Bibcode:1992ldef.symp..763L.
Luttrell, William E.; Giles, Cory B. (2007). "Toxic tips: Osmium tetroxide". Journal of Chemical Health and Safety. 14 (5): 40–41. doi:10.1016/j.jchas.2007.07.003.
"How to Handle Osmium Tetroxide". University of California, San Diego. Archived from the original on February 21, 2006. Retrieved 2009-06-02.
Chisholm, Hugh, ed. (1911). "Osmium". Encyclopædia Britannica. 20 (11th ed.). Cambridge University Press. p. 352.

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