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Cesium

Cesium Suppliers list
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Products Intro: Product Name:Cesium
CAS:7440-46-2
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CAS:7440-46-2
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CAS:7440-46-2
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CAS:7440-46-2
Purity:99.98%(Metalsbasis) Package:1g,25g,5g
Cesium Basic information
Occurrence and Uses Production
Product Name:Cesium
Synonyms:CESIUM STANDARD;CAESIUM;CAESIUM STANDARD;Cesium (99.5%);Cesium(99.9+%) (prescored ampoule) (under argon);Cesiumbreaksealampouleunderargon;Cesiumprescoredampouleunderargon;CESIUM IN VIALS
CAS:7440-46-2
MF:Cs
MW:132.91
EINECS:231-155-4
Product Categories:Alkali MetalsMetal and Ceramic Science;Cesium;metal or element;Metals;Reduction;Synthetic Reagents
Mol File:7440-46-2.mol
Cesium Structure
Cesium Chemical Properties
Melting point 28.5 °C(lit.)
Boiling point 705 °C(lit.)
density 1.873 g/mL at 25 °C(lit.)
vapor pressure 1 mm Hg ( 279 °C)
storage temp. 2-8°C
solubility H2O: soluble
form ingot
color Silver
resistivity19 μΩ-cm, 0°C
Water Solubility reacts with H2O to evolve H2; soluble liquid NH3 [MER06]
Sensitive moisture sensitive
Merck 13,2018
Stability:Flammable solid; highly flammable in powder form. Moisture-sensitive. Incompatible with chlorine, phosphorus, water.
CAS DataBase Reference7440-46-2(CAS DataBase Reference)
Safety Information
Hazard Codes Xi,C,F
Risk Statements 36/38-34-14/15-11
Safety Statements 26-45-43-36/37/39-16-8
RIDADR UN 3264 8/PG 3
WGK Germany 3
RTECS FK9225000
10
TSCA Yes
HazardClass 4.3
PackingGroup I
MSDS Information
ProviderLanguage
ACROS English
SigmaAldrich English
ALFA English
Cesium Usage And Synthesis
Occurrence and UsesCesium was discovered by Bunsen and Kirchoff in 1860. It is found in the minerals pollucite, lepidolite, and the borate rhodizite. Pollucite, CsAlSi2O6, is a hydrated silicate of aluminum and cesium. The concentration of cesium in the earth’s crust is estimated to be 3 mg/kg, and in sea water 0.3μg/L.
Cesium is used as a getter in electron tubes. Other applications are in photoelectric cells; ion propulsion systems; heat transfer fluid in power generators; and atomic clocks. The radioactive Cs-37 has prospective applications in sterilization of wheat, flour, and potatoes.
ProductionCesium is obtained from its ore pollucite. The element in pure form may be prepared by several methods: (i) electrolysis of fused cesium cyanide, (ii) thermal reduction of cesium chloride with calcium at elevated temperatures, and (iii) thermal decomposition of cesium azide. It is stored under mineral oil. The element must be handled under argon atmosphere.
Chemical Propertiessilvery, light ductile metal
HistoryCesium was discovered spectroscopically by Bunsen and Kirchhoff in 1860 in mineral water from Durkheim. Cesium, an alkali metal, occurs in lepidolite, pollucite (a hydrated silicate of aluminum and cesium), and in other sources. One of the world’s richest sources of cesium is located at Bernic Lake, Manitoba. The deposits are estimated to contain 300,000 tons of pollucite, averaging 20% cesium. It can be isolated by electrolysis of the fused cyanide and by a number of other methods. Very pure, gas-free cesium can be prepared by thermal decomposition of cesium azide. The metal is characterized by a spectrum containing two bright lines in the blue along with several others in the red, yellow, and green. It is silvery white, soft, and ductile. It is the most electropositive and most alkaline element. Cesium, gallium, and mercury are the only three metals that are liquid at room temperature. Cesium reacts explosively with cold water, and reacts with ice at temperatures above –116°C. Cesium hydroxide, the strongest base known, attacks glass. Because of its great affinity for oxygen the metal is used as a “getter” in electron tubes. It is also used in photoelectric cells, as well as a catalyst in the hydrogenation of certain organic compounds. The metal has recently found application in ion propulsion systems. Cesium is used in atomic clocks, which are accurate to 5 s in 300 years. A second of time is now defined as being the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyper-fine levels of the ground state of the cesium-133 atom. Its chief compounds are the chloride and the nitrate. Cesium has 52 isotopes and isomers with masses ranging from 112 to 148. The present price of cesium is about $50/g (99.98%) sealed in a glass ampoule.
UsesIn photoelectric cells, as a "getter" in vacuum tubes; in photoemitter devices, scintillation counters. Adsorbent in CO2 purifn; scavenger of gases and impurities in metallurgy. For doping catalysts. For construction and operation of one type of atomic clock based on the vibrational frequency (9,192.76 megacycles/sec) of 133Cs. 137Cs in process control instruments, sewage and sludge sterilization.
DefinitionAn alkali-metal element of group IA of the periodic table, atomic number 55, aw 132.9054, valence 1. No stable isotopes.
General DescriptionA soft metallic solid. Melts at 85°F. Causes burns to skin and eyes.
Air & Water ReactionsHighly flammable. Cesium is spontaneously flammable in air at room temperature, if the surface is clean [Merck 11th ed. 1989]. Reacts with water to generate enough heat to ignite the hydrogen produced during the reaction, and to generate caustic Cesium hydroxide [Mellor 2 419 1946-47].
Reactivity ProfileCesium METAL reacts violently with oxidizing agents, even weaker ones. Reacts with boron trifluoride with incandescence when heated [Merck 11th ed. 1989]. Reacts explosively with maleic anhydride [Chem Safety Data Sheet SD-88 1962; Chem. Haz. Info. Series C-71 1960]. Burns in chlorine with a luminous flame [Mellor 2 Supp. 1:380 1956]. Reacts violently with most acids. Reacts violently with fluorine, chlorine, bromine and iodine. Reacts with incandescence with sulfur and phosphorus. Burns vigorously in air.
HazardDangerous fire and explosion risk, ignites spontaneously in moist air, may explode in contact with sulfur or phosphorus, reacts violently with oxi- dizing materials, causes burns in contact with skin.
Health HazardInhalation or contact with vapors, substance or decomposition products may cause severe injury or death. May produce corrosive solutions on contact with water. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control may cause pollution.
Fire HazardProduce flammable gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Runoff may create fire or explosion hazard.
Safety ProfileModerately toxic by intraperitoneal route. Cesium is quite similar to potassium in its elemental state. It has been shown, however, to have pronounced physiological action in experimentation with animals. Hyper-irritability, including marked spasms, has been shown to follow the administration of cesium in amounts equal to the potassium content of the diet. It has been found that replacing the potassium in the diet of rats with cesium caused death after 10-17 days. Ignites spontaneously in air. Violent reaction with water, moisture, or steam releases hydrogen gas whch explodes. Violent reaction with acids, halogens, and other oxidizing materials. Incandescent reaction with nonmetals (e.g., sulfur, phosphorus). See also SODIUM.
Cesium Preparation Products And Raw materials
Raw materialsArgon
Tag:Cesium(7440-46-2) Related Product Information
BERYLLIUM GADOLINIUM NEODYMIUM Germanium Carbon CESIUM AA STD. CESIUM - 1% HCL 100ML POLY(CESIUM ACRYLATE) METHACRYLATE, CESIUM,METHACRYLIC ACID, CESIUM SALT 1,1,1,5,5,5-HEXAFLUORO-2,4-PENTANEDIONATO CESIUM CESIUM ALUMINUM ORTHOSILICATE -100 Cesium sulfate, II CESIUM TRIIODIDE Cesium fluoride (Cs2F2),Cesium monofluoride,Cesium fluoride (CsF) CESIUM PERMANGANATE cesium(i)nitrate(1:1 CESIUM HEXAFLUOROARSENATE CESIUM TELLURATE