A shiny, ductile metallic element first identified in 1923. Hafnium has an abundance in the earth's crust of about 5 ppm. It is found in the minerals zircon, cyrtolite, alvite, and malacon. Hafnium occurs naturally with zirconium and the two metals are very difficult to separate. It is used as a neutron absorbing material in nuclear reactors, as a filament in lightbulbs and as a cathode in x-ray tubes. Hafnium is also used as an oxygen and nitrogen scavenger.
Synonyms and Related Terms
Hf; afnio (It.); Háfnio (Port.); hafnio (Esp.)
Soluble in warm HCl and sulfuric acid. Resistant to weak acids and their salts.
|Composition||Hf (atomic no. 72)|
|Molecular Weight||atomic wt = 178.49|
Hazards and Safety
Toxic by inhalation. Powder is explosive in air.
Web Elements: Website
Sources Checked for Data in Record
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- Website address 1 Comment: Web Elements at http://www.webelements.com/webelements/elements/text/Hf/hist.html