Properties of Zirconium (Zr)
Zirconium is a chemical element with the symbol (Zr) and atomic number 40. It is a shiny, grayish-white metal that is part of the transition metal group in the periodic table. Zirconium is known for its corrosion resistance, and it is often used in various alloys and as a cladding material for nuclear reactor fuel rods due to its ability to withstand high temperatures and chemical attacks.
The following table provides a comprehensive list of zirconium (Zr) 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 | 40 |
| Molar Mass | 91.224 g/mol |
| Density | 6520 kg/m3 |
| Mechanical Properties | Metric |
| Young’s Modulus (E) | 97.1 GPa |
| Shear Modulus (G) | 36.5 GPa |
| Bulk Modulus (K) | 89.8 GPa |
| Poisson’s Ratio (ν) | 0.38 |
| Mohs Hardness | 5 |
| Thermal Properties | Metric |
| Melting Point | 1854 °C |
| Boiling Point | 4377 °C |
| Thermal Conductivity (27°C) | 22.7 W/m·K |
| Specific Heat Capacity (Cp) (25°C) | 278 J/kg·K |
| Coefficient of Thermal Expansion (αL) (25°C) | 5.7×10-6 1/°C |
| Electrical Properties | Metric |
| Electrical Resistivity | 4.2×10-5 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)