Hafnium

Hafnium as en cheemisk element mä det ufkörtang Hf an det atoomnumer 72. Hat as en grä auergungsmetal.

Tekst üüb Öömrang


Eegenskapen
Algemian
Nööm, Symbool, Numer Hafnium, Hf, 72
Seerie Auergungsmetal
Skööl, Periode, Blook 4, 6, d
Klöör, Skak stialgrä
CAS-Numer 7440-58-6
Uundial 4,2 ppm[1]
Atomaar [2]
Atoommase 178,49(2)[3] u
Atoomraadius (bereegent) 155 (208) pm
Kovalent-Raadius 150 pm
Elektroonen [Xe] 4f14 5d2 6s2
1. Ionisiarang 658,5 kJ/mol
2. Ionisiarang 1440 kJ/mol
3. Ionisiarang 2250 kJ/mol
4. Ionisiarang 3216 kJ/mol
Füsikaalisk [4]
Tustant fäät
Feranrangen tau (α-/β-Hf)
Kristal hexagonaal
Sachthaid 13,28 g/cm3 (25 °C)[5]
Hardhaid 5,5
Magnetismus paramagneetisk[6] (Χm = 7,0 · 10−5)[7]
Smoltponkt 2506 K (2233 °C)
Köögponkt 4876 K[8] K (4603 °C)
Molaar Rüm 13,44 · 10−6 m3/mol
Dampwaremk 648 kJ/mol[8] kJ/mol
Smoltwaremk 25,5 kJ/mol
Dampdruk 0,00013[9] Pa bei 1970 K
Faard faan a tuun 3010 m/s bi 293,15 K
Waremk 140 J/(kg · K)
Elektrisk struumfeerang 3,12 · 106 A/(V · m)
Waremkfeerang 23 W/(m · K)
Cheemisk [10]
Oksidatsionstustant 4
Sür of baasisk amfoteer
Normoolpotentiaal −1,505 V (HfO2 + 4 H+ + 4 e
→ Hf + 2 H2O)
Elektronegatiwiteet 1,3 (Pauling-Skala)
Isotoopen
Isotoop NH t1/2 Aktiwiteet Energii (MeV) Produkt
174Hf

0,162 %

2 · 1015 a α 2,495 170Yb
175Hf

{syn.}

70 d ε 0,686 175Lu
176Hf

5,206 %

stabiil
177Hf

18,606 %

stabiil
178Hf

27,297 %

stabiil
179Hf

13,629 %

stabiil
180Hf

35,1 %

stabiil
182Hf

{syn.}

9·106 a β 0,373 182W
Muar isotoopen bi List faan isotoopen
NMR-Eegenskapen
  Spin (I) γ uun
rad·T−1·s−1
Er(1H) fL bi
B = 4,7 T
uun MHz
177Hf 7/2 8,347 · 106 0,000632 6,24
179Hf −9/2 5,002 · 106 0,000216 3,74
Seekerhaid
GHS-Kääntiaken [9]

Polwer

02 – Braant fiks gau

Gefoor

H- an P-wäärnang H: 250
EUH: nian EUH-wäärnang
P: 210 [11]
EU-Gefoorentiaken
ei bekäänd
ei bekäänd
R- an S-wäärnang R: ?
S: ?
Muar wäärnangen
MAK-miatSweits: 0,5 mg·m−3 (stoof)[12]
Miast wurd SI-ianhaiden brükt.

Bilen

Luke uk diar

Commons Commonskategorii: Hafnium – Saamlang faan bilen of filmer

Kwelen

  1. Harry H. Binder: Lexikon der chemischen Elemente. S. Hirzel Verlag 1999, ISBN 3-7776-0736-3.
  2. A taalen för't infobox kem miast faan www.webelements.com (Hafnium) .
  3. CIAAW, Standard Atomic Weights Revised 2013.
  4. A taalen för't infobox kem miast faan www.webelements.com (Hafnium) .
  5. N. N. Greenwood, A. Earnshaw: Chemie der Elemente. 1. aplaag. 1988, ISBN 3-527-26169-9, S. 1231.
  6. C. J. Kriessman, T. R. McGuire: Magnetic Susceptibility of Hafnium and Manganese. In: Physical Review. 98, 4, 1955, S. 936–937, doi:10.1103/PhysRev.98.936.
  7. Robert C. Weast (Hrsg.): CRC Handbook of Chemistry and Physics. CRC (Chemical Rubber Publishing Company), Boca Raton 1990, ISBN 0-8493-0470-9, S. E-129 bit E-145. Wäärser diar uun g/mol an uun cgs-ianhaiden. Heer amreegent tu SI-wäärs.
  8. Yiming Zhang, Julian R. G. Evans, Shoufeng Yang: Corrected Values for Boiling Points and Enthalpies of Vaporization of Elements in Handbooks. Uun: Journal of Chemical & Engineering Data. 56, 2011, S. 328–337, doi:10.1021/je1011086.
  9. Iindraanj tu Hafnium, Pulver uun't GESTIS-dootenbeenk faan't IFA, ufrepen di 30. April 2017 (mä JavaScript).
  10. A taalen för't infobox kem miast faan www.webelements.com (Hafnium) .
  11. Dootenbleed Hafnium, powder, −325 mesh, 99.5% trace metals basis (purity excludes ~2% zirconium), contains 1:10 pentanol to water solution as stabilizer bi Sigma-Aldrich, ufrepen di 3. Mai 2017.
  12. Schweizerische Unfallversicherungsanstalt (SUVA): Aktuel MAK- an BAT-wäärser
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