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Home > Art, Film & Photography > Hafnium Compounds: Hafnium(iv) Chloride, Hafnium(iv) Oxide, Hafnium Diboride, Hafnium(iv) Carbide, Tantalum Hafnium Carbide, Hafnium(iv) Silicate
Hafnium Compounds: Hafnium(iv) Chloride, Hafnium(iv) Oxide, Hafnium Diboride, Hafnium(iv) Carbide, Tantalum Hafnium Carbide, Hafnium(iv) Silicate

Hafnium Compounds: Hafnium(iv) Chloride, Hafnium(iv) Oxide, Hafnium Diboride, Hafnium(iv) Carbide, Tantalum Hafnium Carbide, Hafnium(iv) Silicate


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Chapters: Hafnium(iv) Chloride, Hafnium(iv) Oxide, Hafnium Diboride, Hafnium(iv) Carbide, Tantalum Hafnium Carbide, Hafnium(iv) Silicate. Source: Wikipedia. Pages: 24. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: 432 C (705 K) Hafnium(IV) chloride is the inorganic compound with the formula HfCl4. This colourless solid is the precursor to most hafnium organometallic compounds. It functions as a Lewis acid and catalyst for certain alkylation and isomerism reactions. Hafnium the metal center in the complex occurs in nature in small amounts associated with Zirconium minerals such as zircon, cyrtolite and baddeleyite. Zircon contains 0.05 to 2.0 percent Hafnium oxide HfO2, cyrtolite with 5.5 to 17 percent HfO2 and baddeleyite contains 1.0 to 1.8 percent HfO2. Hafnium and zirconium compounds are extracted from ores together because Hafnium and Zirconium have very similar chemical and physical properties. Therefore in the synthesis of Hafnium(IV) chloride which requires HfO2, the HfO2 has to be purified from the mineral ore and this can be achieved through decomposition. HfCl4 is produced by several procedures: (1) the reaction of carbon tetrachloride and hafnium oxide at above 450 C; (2) chlorination of a mixture of HfO2 and carbon above 600 C; and (3) chlorination of hafnium carbide above 250 C. Hafnium(IV) chloride is prepared by heating a mixture of HfO2 and Carbon in a stream of Chlorine or Sulfur monochloride under hot temperatures as shown in the equation below. HfO2 + 4Cl + C HfCl4 + CO2HfCl4 could also be prepared by reacting Hf(OH)4 with HCl and then boiling the reactants until crystals are formed \\. Since Hf mineral ores contain Zr compounds as well, some ZrCl4 is also formed in the process of synthesizing HfCl4 therefore the product has to be purified in order to obtain pure ...More: http: //booksllc.net/?id=2694328


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Product Details
  • ISBN-13: 9781158394852
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 26
  • Spine Width: 2 mm
  • Weight: 50 gr
  • ISBN-10: 1158394853
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: Hafnium(iv) Chloride, Hafnium(iv) Oxide, Hafnium Diboride, Hafnium(iv) Carbide, Tantalum Hafnium Carbide, Hafnium(iv) Silicate
  • Width: 229 mm


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Hafnium Compounds: Hafnium(iv) Chloride, Hafnium(iv) Oxide, Hafnium Diboride, Hafnium(iv) Carbide, Tantalum Hafnium Carbide, Hafnium(iv) Silicate
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Hafnium Compounds: Hafnium(iv) Chloride, Hafnium(iv) Oxide, Hafnium Diboride, Hafnium(iv) Carbide, Tantalum Hafnium Carbide, Hafnium(iv) Silicate
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Hafnium Compounds: Hafnium(iv) Chloride, Hafnium(iv) Oxide, Hafnium Diboride, Hafnium(iv) Carbide, Tantalum Hafnium Carbide, Hafnium(iv) Silicate

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