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Composition: Hf
Form: Foil (Light Tight)
Material: Hafnium
CAS Number: 7440-58-6
Commodity: Metals
Light Tight:
Light Tight
Hafnium Foil (Light Tight) is a specialized foil form of hafnium engineered to be completely opaque, eliminating pinholes and ensuring total light blockage. It retains hafnium’s inherent high melting point, corrosion resistance, and thermal stability, making it valuable for applications where both optical shielding and material resilience are required. This form is particularly relevant in aerospace, vacuum electronics, and optical engineering industries, where light leakage can compromise device performance. Specific technologies benefiting from light-tight hafnium foil include high-pressure discharge lamps where hafnium foils act as getters to trap hydrogen contaminants, vacuum deposition systems that demand uniform light-blocking barriers, and optical-electronic devices where suppression of stray light is critical. In research, this material is indispensable for thin-film studies, sputtering targets, and photonic shielding in environments where precision and consistency are paramount. Hafnium Foil (Light Tight) thus provides an essential balance of optical control and high-performance material properties, ensuring its value in both scientific and industrial innovation.
Material Properties for Metals
Atomic Properties
| Element | Value |
|---|---|
| Atomic number | 72 |
| Crystal structure | Hexagonal close packed |
| Electronic structure | Xe 4f¹⁴ 5d² 6s² |
| Valences shown | 4 |
| Atomic weight( amu ) | 178.49 |
| Thermal neutron absorption cross-section( Barns ) | 103 |
| Photo-electric work function( eV ) | 3.9 |
| Natural isotope distribution( Mass No./% ) | 179/ 13.8 |
| Natural isotope distribution( Mass No./% ) | 176/ 5.2 |
| Natural isotope distribution( Mass No./% ) | 180/ 35.2 |
| Natural isotope distribution( Mass No./% ) | 174/ 0.2 |
| Natural isotope distribution( Mass No./% ) | 177/ 18.5 |
| Natural isotope distribution( Mass No./% ) | 178/ 27.1 |
| Atomic radius - Goldschmidt( nm ) | 0.159 |
| Ionisation potential( No./eV ) | 3/ 23.3 |
| Ionisation potential( No./eV ) | 1/ 7.0 |
| Ionisation potential( No./eV ) | 2/ 14.9 |
| Ionisation potential( No./eV ) | 4/ 33.3 |
Mechanical Properties
| Element | Value |
|---|---|
| Material condition | Hard |
| Material condition | Soft |
| Poisson's ratio | 0.26 |
| Poisson's ratio | 0.26 |
| Bulk modulus( GPa ) | 109 |
| Bulk modulus( GPa ) | 109 |
| Tensile modulus( GPa ) | 141 |
| Tensile modulus( GPa ) | 141 |
| Hardness - Vickers( kgf mm⁻² ) | 150-180 |
| Tensile strength( MPa ) | 445 |
| Tensile strength( MPa ) | 745 |
| Yield strength( MPa ) | 365 |
| Yield strength( MPa ) | 240 |
Electrical Properties
| Element | Value |
|---|---|
| Electrical resistivity( µOhmcm ) | 32.2@20@20°C |
| Superconductivity critical temperature( K ) | 0.128 |
| Temperature coefficient( K⁻¹ ) | 0.0044@0-100°C |
Physical Properties
| Element | Value |
|---|---|
| Boiling point( C ) | 4602 |
| Density( gcm⁻³ ) | 13.1@20°C |
Thermal Properties
| Element | Value |
|---|---|
| Melting point( C ) | 2227 |
| Latent heat of evaporation( J g⁻¹ ) | 3700 |
| Latent heat of fusion( J g⁻¹ ) | 122 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 146@25°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 23@0-100°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 6@0-100°C |
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