Properties of Hafnium (Hf)
Hafnium is a chemical element with the symbol (Hf) and atomic number 72. It is a lustrous, silvery-gray transition metal. Hafnium is typically found in zirconium minerals, and it is often used in the aerospace and nuclear industries due to its ability to withstand high temperatures and its neutron-absorbing properties.
The following table provides a comprehensive list of hafnium (Hf) properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Crystal Structure | Hexagonal close-packed (hcp) |
| Atomic Number | 72 |
| Molar Mass | 178.49 g/mol |
| Density | 13310 kg/m3 |
| Mechanical Properties | Metric |
| Young’s Modulus (E) | 141 GPa |
| Shear Modulus (G) | 56 GPa |
| Bulk Modulus (K) | 109 GPa |
| Poisson’s Ratio (ν) | 0.26 |
| Mohs Hardness | 5.5 |
| Thermal Properties | Metric |
| Melting Point | 2233 °C |
| Boiling Point | 4600 °C |
| Thermal Conductivity (27°C) | 23 W/m·K |
| Specific Heat Capacity (Cp) (25°C) | 144 J/kg·K |
| Coefficient of Thermal Expansion (αL) (25°C) | 5.9×10-6 1/°C |
| Electrical Properties | Metric |
| Electrical Resistivity | 3.37×10-5 Ω·cm |
Unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)
Related Pages
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017. 3) A.M. Howatson, P.G. Lun, J.D. Todd, P.D. Engineering Tables and Data. United Kingdom: University of Oxford, Department of Engineering Science, 2009.