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Nb   -   Niobium (41/92.9064)

Material List
  • Naturally occurring isotopes: 93
  • Density: 8.57 (293.15K) g/cm3
  • Melting point: 2468 ± 10 oC
  • Boiling point: 4742 oC
  • Latent heat of fusion: 288.4 J/g
  • Specific heat: 0.265 J/g/K (at room temp.)
  • Coefficient of lineal thermal expansion: 7.31E-06 cm/cm/K (at room temp.)
  • Thermal conductivity: 5.37E-01 W/cm/K (at room temp.)
  • Electrical resistivity: 1.46E-05 hm-cm (at room temp.)
  • lonization potential (1st): 6.88 eV
  • Electronic work function Φ: 4.3
  • Oxidation potentials: Nb → Nb3+ + 3e = 1.099 V
  • Chemical valence: 2 3 4 5
  • Electrochemical equivalents: 0.69327 g/amp-hr
  • lonic radius: 0.69 angstrom
  • Valence electron potential: 104 -eV
  • Principal quantum number: 5
  • Principal electron shells: K L M N O
  • Electronic configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d4 5s1
  • Valence electrons: 4d4 5s1
  • Crystal form: FCC
  • Half life:
  • Cross section σ: 1.15 ± 0.05 barns
  • Vapor pressure: 7.55E-02 Pa (at melting point)