Basic information Supplier

7439-91-0

Basic information Supplier
7439-91-0 Basic informationMore
USE
Mosander in 1839 extracted a new earth lanthana, from impure cerium nitrate, and recognized the new element. Lanthanum is found in rare-earth minerals such as cerite, monazite, allanite, and bastnasite. Monazite and bastnasite are principal ores in which lanthanum occursin percentages up to 25 and 38%, respectively. Misch metal, used in making lighter flints, contains about 25% lanthanum. Lanthanum was isolated in relatively pure form in 1923. Ion-exchange and solvent extraction techniques have led to much easier isolation of the so-called “rare-earth” elements. The availability of lanthanum and other rare earths has improved greatly in recent years. The metal can be produced by reducing the anhydrous fluoride with calcium. Lanthanum is silvery white, malleable, ductile, and soft enough to be cut with a knife. It is one of the most reactive of the rare-earth metals. It oxidizes rapidly when exposed to air. Cold water attacks lanthanum slowly, and hot water attacks it much more rapidly. The metal reacts directly with elemental carbon, nitrogen, boron, selenium, silicon, phosphorus, sulfur, and with halogens. At 310°C, lanthanum changes from a hexagonal to a face-centered cubic structure, and at 865°C it again transforms into a body-centered cubic structure. Natural lanthanum is a mixture of two isotopes, one of which is stable and one of which is radioactive with a very long halflife. Thirty other radioactive isotopes are recognized. Rareearth compounds containing lanthanum are extensively used in carbon lighting applications, especially by the motion picture industry for studio lighting and projection. This application consumes about 25% of the rare-earth compounds produced. La2O3 improves the alkali resistance of glass, and is used in making special optical glasses. Small amounts of lanthanum, as an additive, can be used to produce nodular cast iron. There is current interest in hydrogen sponge alloys containing lanthanum. These alloys take up to 400 times their own volume of hydrogen gas, and the process is reversible. Heat energy is released every time they do so; therefore these alloys have possibilities in energy conservation systems. Lanthanum and its compounds have a low to moderate acute toxicity rating; therefore, care should be taken in handling them. The metal costs about $2/g (99.9%).
Lastest Price from LANTHANUM manufacturers

Browse by Nationality 7439-91-0 Suppliers >Global suppliers

Beijing (3) Shanghai (25) Tianjin (1) Sichuan (5) Guangdong (3) Fujian (1) Hubei (1) Shandong (4) Henan (2) Jiangsu (2) Shaanxi (1) Hong Kong (1) Taiwan (1) Member (47) All (50)
Please select the suppliers
Recommend You Select Member Companies
  • Company Name:J & K SCIENTIFIC LTD.
  • Tel:400-666-7788 010-82848833-
  • Products Intro:Product Name:Lanthanum powder (99.9% REO)
    CAS:7439-91-0
    Purity:(99.9% REO) Package:10g;50g More...
  • CB Index:76
  • Related Information:Catalog(96815)
  •  
  • Company Name:Alfa Aesar
  • Tel:400-610-6006
  • Products Intro:Product Name:LanthanuM sputtering target, 76.2MM dia x 1.59MM thick
    CAS:7439-91-0
    Package:1each Remarks:046064 More...
  • CB Index:84
  • Related Information:Catalog(30163)
  •  
  • Company Name:Energy Chemical
  • Tel:400-005-6266 021-58432009
  • Products Intro:Product Name:LanthanuM rod, 6.35MM (0.25in) dia, 99.9% (REO)
    CAS:7439-91-0
    Purity:99.9%(REO) Package:100g,25g More...
  • CB Index:61
  • Related Information:Catalog(44026)
  •  
  • Company Name:Adamas Reagent, Ltd.
  • Tel:400-600-9262
  • Products Intro:Product Name:Lanthanum
    CAS:7439-91-0
    Purity:99%9 Package:5g;25g More...
  • CB Index:59
  • Related Information:Catalog(13918)
  •  
  • Company Name:Shanghai Hanhong Scientific Co.,Ltd.
  • Tel:021-54306202-
  • Products Intro:Product Name:Lanthanum
    CAS:7439-91-0
    More...
  • CB Index:64
  • Related Information:Catalog(43258)
  •  
  • Company Name:Chengdu XiYa Chemical Technology Co., Ltd.
  • Tel:400-990-3999
  • Products Intro:Product Name:Lanthanum Metal
    CAS:7439-91-0
    Purity:99% HPLC Package:25g,100g,500g More...
  • CB Index:57
  • Related Information:Catalog(9624)
  •  
  • Company Name:BEST-REAGENT
  • Tel:18981987031 400-1166-196
  • Products Intro:Product Name:LANTHANUM
    CAS:7439-91-0
    Purity:99% HPLC Package:10g;50g;100g;500g;1kg;5kg;25kg More...
  • CB Index:57
  • Related Information:Catalog(9899)
  •  
1 2 3 4 5 6