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Iridium

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CAS:7439-88-5
Purity:99% Package:100g,500g,1kg,5kg,10kg
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Products Intro: Product Name:Iridium
CAS:7439-88-5
Purity:99.9% Package:100g,1000g,10000g,25000g
Iridium Basic information
Description Uses Reactions
Product Name:Iridium
Synonyms:IRIDIUM METAL;IRIDIUM PLASMA EMISSION SPECTROSCOPY STANDARD;IRIDIUM PLASMA EMISSION STANDARD;IRIDIUM, PLASMA STANDARD SOLUTION;Iridiumslugs(99.99%);Iridiumsponge(99.95%);Iridiumwire(99.7%);Iridiumwire(99.8%)
CAS:7439-88-5
MF:Ir
MW:192.22
EINECS:231-095-9
Product Categories:Inorganics;AA Standard SolutionsSpectroscopy;AAS;Alphabetic;ChlorideAnalytical Standards;ISpectroscopy;Matrix Selection;Reference/Calibration Standards;Single Solution;Standard Solutions;Iridium;Metal and Ceramic Science;Metals;metal or element;#N/A
Mol File:7439-88-5.mol
Iridium Structure
Iridium Chemical Properties
Melting point 2450 °C(lit.)
Boiling point 4130 °C(lit.)
density 1.05 g/mL at 25 °C
storage temp. Flammables area
solubility Soluble in aqua regia.
form wire
color White to pale yellow
resistivity4.71 μΩ-cm
Water Solubility INSOLUBLE
Merck 13,5102
CAS DataBase Reference7439-88-5(CAS DataBase Reference)
NIST Chemistry ReferenceIridium(7439-88-5)
EPA Substance Registry SystemIridium(7439-88-5)
Safety Information
Hazard Codes F,Xi
Risk Statements 36-36/37/38-11
Safety Statements 16-26-36/37/39
RIDADR UN 3089 4.1/PG 2
WGK Germany 3
TSCA Yes
HazardClass 4.1
PackingGroup III
Hazardous Substances Data7439-88-5(Hazardous Substances Data)
MSDS Information
ProviderLanguage
SigmaAldrich English
ACROS English
ALFA English
Iridium Usage And Synthesis
DescriptionIridium metal was detected in the black residue of aqua regia extract of platinum and identified as an element by British chemist Smithson Tennant in 1803. Around the same time, existence of this new metal was proposed by Vauquelin and deFourcroy in France in the course of their extraction of platinum by aqua regia. Tennant named this element Iridium after the Greek word, Iris, meaning rainbow.
Iridium occurs in small amounts in native platinum or platinum metal alloys. Iridium and osmium together constitute “osmiridium,” which is resistant to chemical attack and is a byproduct of platinum extraction.
UsesThe most important use of iridium is as an alloying metal for platinum and palladium. Such alloys are used for jewelry, decorative purposes, electrical contacts, thermocouples, crucibles, electrodes, hypodermic needles, and medical accessories. Iridium enhances resistance of platinum to chemical attack and corrosion. It also enhances hardness and tensile strength. The radioisotope Ir-192 is used in examination of ferrous welds and in other radiographic applications.
ReactionsAt ordinary temperatures iridium exhibits strong resistance to chemical attack. At elevated temperatures of about 600°C, iridium metal combines with oxygen to form a coating of iridium dioxide, IrO2. Similarly, the metal reacts with halogens only at elevated temperatures. It reacts with fluorine at 250°C, forming iridium hexafluoride, IrF6, and, to a lesser extent, iridium tetrachloride IrCl4. Heating with chlorine at 600°C produces iridium trichloride, IrCl3. Iridium forms alloys with several metals—mostly platinum group metals.
Iridium does not react with concentrated acids or with molten alkalies.
Chemical PropertiesBlack Powder
HistoryDiscovered in 1803 by Tennant in the residue left when crude platinum is dissolved by aqua regia. The name iridium is appropriate, for its salts are highly colored. Iridium, a metal of the platinum family, is white, similar to platinum, but with a slight yellowish cast. It is very hard and brittle, making it very hard to machine, form, or work. It is the most corrosion-resistant metal known, and was used in making the standard meterbar of Paris, which is a 90% platinum–10% iridium alloy. This meter bar was replaced in 1960 as a fundamental unit of length (see under Krypton). Iridium is not attacked by any of the acids nor by aqua regia, but is attacked by molten salts, such as NaCl and NaCN. Iridium occurs uncombined in nature with platinum and other metals of this family in alluvial deposits. It is recovered as a by-product from the nickel mining industry. The largest reserves and production of the platinum group of metals, which includes iridium, is in South Africa, followed by Russia and Canada. The U.S. has only one active mine, located at Nye, MT. The presence of iridium has recently been used in examining the Cretaceous-Tertiary (K-T) boundary. Meteorites contain small amounts of iridium. Because iridium is found widely distributed at the K-T boundary, it has been suggested that a large meteorite or asteroid collided with the Earth, killing the dinosaurs, and creating a large dust cloud and crater. Searches for such a crater point to one in the Yucatan, known as Chicxulub. Iridium has found use in making crucibles and apparatus for use at high temperatures. It is also used for electrical contacts. Its principal use is as a hardening agent for platinum. With osmium, it forms an alloy that is used for tipping pens and compass bearings. The specific gravity of iridium is only very slightly lower than that of osmium, which has been generally credited as being the heaviest known element. Calculations of the densities of iridium and osmium from the space lattices give values of 22.65 and 22.61 g/cm3, respectively. These values may be more reliable than actual physical measurements. At present, therefore, we know that either iridium or osmium is the densest known element, but the data do not yet allow selection between the two. Natural iridium contains two stable isotopes. Forty-five other isotopes, all radioactive, are now recognized. Iridium (99.9%) costs about $100/g.
DefinitionMetallic element of atomic number 77, one of the platinum metals, group VIII of the periodic table, aw 192.22, valences = 1,2,3,4,6, two stable isotopes.
UsesIn manufacturing crucibles; in hardening platinum; in making nibs for fountain-pen points.
Purification MethodsIridium is a silver white hard solid which oxidises on the surface in air. Scrape the outer tarnished layer until silver clear and store it under paraffin. It is stable to acids but dissolves in aqua regia. [Gilchrist Chem Rev 32 277 1943.]
Iridium Preparation Products And Raw materials
Preparation ProductsMethyl formate
Raw materialsAmmonium chloride -->Nitrohydrochloric acid-->Ruthenium-->OSMIUM-->Ammonium hexachloroiridate(IV)
Tag:Iridium(7439-88-5) Related Product Information
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