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Hafnium (72Hf178.49)
[7440-58-6]

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Elemental Form

Found in all minerals containing zirconium, hafnium is a ductile metal with a brilliant silver luster. It is strong and extremely corrosion resistant. Zirconium and hafnium's chemistry are virtually identical (except that hafnium's density is twice that of zirconium) and therefore, are extremely difficult to seperate. Hafnium's properties are significantly influenced by the zirconium impurities present.
Melting Point2227°CBoiling Point4603°C
Density13.31g/cm3Specific Heat @ 25°C0.035cal/g°C
Heat of Fusion32.4cal/gHeat of Vaporization155k-cal/g-atom
Atomic Volume13.6W/DFirst Ionization Energy127K-cal/g-mole
Electronegativity1.3Pauling'sCovalent Radius1.44Angstroms
Linear Coefficient of Expansion5.9x10-6K-1Electrical Resistivity35.1µΩ-cm
Crystal StructureHexagonalVapor Pressure @ 2007°C10-9atm
Modulus of Elasticity @ 20°C19.8x106psiThermal Neutron Cross Section105barns/atom
Tensile Strength86,000psi