Diameter[直径] |
38.1mm |
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℃ |