| Diameter[直径] |
50mm |
| Grade[等级] |
Hafnium > 0.2% |
| Length[长度] |
25mm - 100mm |
| Production Method[生产方法] |
Centreless Ground |
| Purity[纯度] |
99.2% |
| Typical Analysis(典型分析) |
| C |
250 PPM |
| Cr |
200 PPM |
| Fe |
200 PPM |
| H |
10 PPM |
| Hf |
2500 PPM |
| N |
100 PPM |
| O |
1000 PPM |
| Atomic Properties(原子属性) |
| Atomic number |
40 |
| Atomic weight ( amu ) |
91.22000 |
| Crystal structure |
Hexagonal Close Packed |
| Electronic structure |
Kr4d?5s? |
| Ionisation potential ( No./eV ) |
4 / 34.34 |
| Ionisation potential ( No./eV ) |
6 / 99 |
| Ionisation potential ( No./eV ) |
2 / 13.13 |
| Ionisation potential ( No./eV ) |
1 / 6.84 |
| Ionisation potential ( No./eV ) |
5 / 81.5 |
| Ionisation potential ( No./eV ) |
3 / 22.99 |
| Natural isotope distribution ( Mass No./% ) |
96 / 2.8 |
| Natural isotope distribution ( Mass No./% ) |
92 / 17.1 |
| Natural isotope distribution ( Mass No./% ) |
91 / 11.2 |
| Natural isotope distribution ( Mass No./% ) |
94 / 17.5 |
| Natural isotope distribution ( Mass No./% ) |
90 / 51.4 |
| Photo-electric work function ( eV ) |
3.80 |
| Thermal neutron absorption cross-section ( Barns ) |
0.1820 |
| Valences shown |
2 ,3,4 |
| Mechanical Properties(机械性能) |
| Bulk modulus ( GPa ) ( Polycrystalline ) |
89.8 |
| Bulk modulus ( GPa ) ( Soft ) |
89.8 |
| Hardness - Vickers ( kgf mm?? ) ( Soft ) |
85 - 100 |
| Material condition |
Polycrystalline |
| Material condition |
Soft |
| Poisson's ratio ( Polycrystalline ) |
0.380 |
| Poisson's ratio ( Soft ) |
0.380 |
| Tensile modulus ( GPa ) ( Polycrystalline ) |
98.00 |
| Tensile modulus ( GPa ) ( Soft ) |
98.00 |
| Tensile strength ( MPa ) ( Soft ) |
350.00 - 390.00 |
| Yield strength ( MPa ) ( Soft ) |
250.0 - 310.0 |
| Electrical Properties(电气特性) |
| Electrical resistivity ( μOhmcm ) |
44@20℃ |
| Superconductivity critical temperature ( K ) |
0.6100 |
| Temperature coefficient ( K?? ) |
0.00440 @0-100℃ |
| Thermal emf against Pt (cold 0C - hot 100C) ( mV ) |
1.17 |
| Physical Properties(物理性质) |
| Boiling point ( C ) |
4377 |
| Density ( g cm?? ) |
6.490 @20℃ |
| Thermal Properties(热性能) |
| Coefficient of thermal expansion ( x10?? K?? ) |
5.900 @0-100℃ |
| Latent heat of evaporation ( J g?? ) |
6360 |
| Latent heat of fusion ( J g?? ) |
211.00 |
| Melting point ( C ) |
1852.00 |
| Specific heat ( J K?? kg?? ) |
281.0 @25℃ |
| Thermal conductivity ( W m?? K?? ) |
22.70 @0-100℃ |
