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HAFNIUM (72Hf178.49)

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Element Description

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.

Property Name Property Value Property Name Property Value
Atomic Code (72Hf178.49) First Ionization Energy 127K-cal/g-mole
CAS # 7440-58-6 Electronegativity 1.3Pauling's
Covalent Radius 1.44Angstroms
Melting Point 2227°C Linear Coefficient of Expansion 5.9x10-6K-1
Boiling Point 4603°C Electrical Resistivity 35.1µΩ-cm
Density 13.31g/cm3 Crystal Structure Hexagonal
Specific Heat @ 25°C 0.035cal/g°C Vapor Pressure @ 2007°C 10-9atm
Heat of Fusion 32.4cal/g Modulus of Elasticity @ 20°C 19.8x106psi
Heat of Vaporization 155k-cal/g-atom Thermal Neutron Cross Section 105barns/atom
Atomic Volume 13.6W/D Tensile Strength 86,000psi

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