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Hf   -   Hafnium (72/178.49)

Material List
  • Naturally occurring isotopes: 180 178 177 179 176 174
  • Density: 13.31 (293.15K) g/cm3
  • Melting point: 2227 ± 20 oC
  • Boiling point: 4602 oC
  • Latent heat of fusion: 122 J/g
  • Specific heat: 0.144 J/g/K (at room temp.)
  • Coefficient of lineal thermal expansion: 5.60E-06 cm/cm/K (at room temp.)
  • Thermal conductivity: 2.30E-01 W/cm/K (at room temp.)
  • Electrical resistivity: 3.51E-05 hm-cm (at room temp.)
  • lonization potential (1st): 6.65 eV
  • Electronic work function Φ: 3.9
  • Oxidation potentials: Hf → Hf4+ + 4e = 1.70 V
  • Chemical valence: 4
  • Electrochemical equivalents: 1.6649 g/amp-hr
  • lonic radius: 0.71 angstrom
  • Valence electron potential: 81 -eV
  • Principal quantum number: 6
  • Principal electron shells: K L M N O P
  • Electronic configuration: 1s2 2s2 2p6 3s2 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d2 6s2
  • Valence electrons: 5d2 6s2
  • Crystal form: HCP
  • Half life:
  • Cross section σ: 103 ± 3 barns
  • Vapor pressure: 1.12E-03 Pa (at melting point)