Properties of Ruthenium (Ru)
Ruthenium is a chemical element with the symbol (Ru) and atomic number 44. It is a rare transition metal belonging to the platinum group of the periodic table. Ruthenium is known for its exceptional hardness, resistance to corrosion, and ability to withstand high temperatures.
The following table provides a comprehensive list of ruthenium (Ru) properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
Click on the button to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Crystal Structure | Hexagonal close-packed (hcp) |
| Atomic Number | 44 |
| Molar Mass | 101.07 g/mol |
| Density | 12370 kg/m3 |
| Mechanical Properties | Metric |
| Young’s Modulus (E) | 432 GPa |
| Shear Modulus (G) | 173 GPa |
| Bulk Modulus (K) | 286 GPa |
| Poisson’s Ratio (ν) | 0.25 |
| Mohs Hardness | 6.5 |
| Thermal Properties | Metric |
| Melting Point | 2336 °C |
| Boiling Point | 4150 °C |
| Thermal Conductivity (27°C) | 117 W/m·K |
| Specific Heat Capacity (Cp) (25°C) | 238 J/kg·K |
| Coefficient of Thermal Expansion (αL) (25°C) | 6.4×10-6 1/°C |
| Electrical Properties | Metric |
| Electrical Resistivity | 7.1×10-6 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)
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.