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Hafnium is a chemical element in the periodic table that has the symbol Hf and atomic number 72. A lustrous, silvery gray tetravalent transition metal, hafnium resembles zirconium chemically and is found in zirconium minerals. Hafnium is used in tungsten alloys in filaments and electrodes and also acts as a neutron absorber in control rods in nuclear power plants.
Notable characteristics
Hafnium is a shiny silvery, ductile metal that is corrosion resistant and chemically similar to zirconium. The properties of hafnium are markedly affected by zirconium impurities and these two elements are amongst the most difficult to separate. The only notable difference between them is their density (zirconium is about half as dense as hafnium).
Hafnium carbide is the most refractory binary compound known and hafnium nitride is the most refractory of all known metal nitrides with a melting point of 3310 °C. This metal is resistant to concentrated alkalis, but halogens react with it to form hafnium tetrahalides. At higher temperatures hafnium reacts with oxygen, nitrogen, carbon, boron, sulfur, and silicon.
More on [ Hafnium ]
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yumemitter (Yumemitter / ããã¿ã£ãã¼ ) Sun, 27 Dec 2009 05:35:02 -0000
[ゆめみったー] RT @hafnium163 : マニキュア塗る夢見た 相変わらず下手くそだった
@hafnium163 ããããããµã³ã¸ã§ãã( ´è¸ï½) å§ããã
yonmoji (4ãã) Sat, 26 Dec 2009 16:44:55 -0000
@hafnium163 いやいや、サンジですよ( ´艸｀) 姉さん。
@hafnium163 ãã®ï¼£ï¼ãã£ã¡ãå¯æãã¨æã(^3^)/ã¾ããããã¯æçã¤ãããªããã©ã･･･(-_-;)
odecom (DECOâ) Sat, 26 Dec 2009 15:29:38 -0000
@hafnium163 そのＣＭめっちゃ可愛いと思う(^3^)/ま、あたしは料理つくれないけどね･･･(-_-;)
@AmeGal - According to the regex dictionary, only hafnium and selfness have the characters (nf) as in #banff.
jim_swanson (Jim Swanson) Sat, 26 Dec 2009 06:36:36 -0000
@AmeGal - According to the regex dictionary, only hafnium and selfness have the characters (nf) as in #banff.
Method for hafnium nitride deposition [6432283] http://bit.ly/8VsgYJ
tweetalot (tweetalot) Thu, 24 Dec 2009 02:00:25 -0000
Method for hafnium nitride deposition [6432283] http://bit.ly/8VsgYJ
Wikipedia (en) Tantalum hafnium carbide: http://bit.ly/6tRMMq
rskttm (ã¤ã¤ã¬ã) Wed, 23 Dec 2009 02:28:58 -0000
Wikipedia (en) Tantalum hafnium carbide: http://bit.ly/6tRMMq
Britannica Nobel Prize: Hafnium - Detailed overview and data.
ChemGlobe: Hafnium - Electronic, thermal, and steric data along with an isotope table.
Meta Description: [ The chemical element [Hf] - Hafnium - Datasheet ]
ChemicalElements.com: Hafnium - Basic information, atomic structure, and isotopes.
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EnvironmentalChemistry.com: Hafnium - Atomic structure, chemical and physical properties, and table of nuclides.
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Hafnium - Data tables and historic information.
It's Elemental: Hafnium - Basic physical and historical information.
Meta Description: [ The Element Hafnium - Basic Physical and Historical Information ]
LANL: Hafnium - History, properties, uses, and handling.
Lenntech: Hafnium - Physical data, chemical properties, health and environmental effects.
Meta Description: [ chemical properties, health and environmental effects of hafnium ]
Visual Elements: Hafnium - General and physical information, source, uses, key isotopes, and ionisation energies.
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WebElements: Hafnium - Extensive information on history, uses, occurrence, compounds, and properties.
Meta Description: [ This WebElements periodic table page contains key information for the element hafnium ]
Wikipedia: Hafnium - Properties of the element, including its history, applications, and characteristics.
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