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Formula: Mo
Form: Foil (Light Tight)
Material: Molybdenum
CAS Number: 7439-98-7
Commodity: Metals
Light Tight: Light Tight

Molybdenum Foil (Light Tight)

Molybdenum Foil (Light Tight) offers exceptional dimensional stability, low outgassing, and high melting point (2,623 °C), making it ideal for high-temperature and ultra-high vacuum (UHV) research. With conductive coatings, it achieves optical densities >8 across UV–VIS–NIR, ensuring reliable light exclusion. It maintains structural integrity up to 1200 °C under load and can be used to 2000 °C in inert/vacuum conditions for short durations. Its high stopping power (e.g., 100 μm foil blocks ~1.2 MeV H⁺ ions) supports ion implantation masking. Commonly used in beamline shielding, furnace linings, and cryogenic radiation baffles, it also offers low secondary electron yield (<0.5 when coated), minimizing noise in electron microscopy and spectroscopy systems.
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Material Properties for Metals

Atomic Properties
Element Value
Atomic number 42
Crystal structure Body centred cubic
Electronic structure Kr 4d⁵ 5s¹
Valences shown 2, 3, 4, 5, 6
Atomic weight( amu ) 95.94
Thermal neutron absorption cross-section( Barns ) 2.65
Photo-electric work function( eV ) 4.2
Natural isotope distribution( Mass No./% ) 95/ 15.9
Natural isotope distribution( Mass No./% ) 96/ 16.7
Natural isotope distribution( Mass No./% ) 98/ 24.1
Natural isotope distribution( Mass No./% ) 97/ 9.6
Natural isotope distribution( Mass No./% ) 92/ 14.8
Natural isotope distribution( Mass No./% ) 94/ 9.3
Natural isotope distribution( Mass No./% ) 100/ 9.6
Atomic radius - Goldschmidt( nm ) 0.14
Ionisation potential( No./eV ) 2/ 16.15
Ionisation potential( No./eV ) 5/ 61.2
Ionisation potential( No./eV ) 68
Ionisation potential( No./eV ) 1/ 7.10
Ionisation potential( No./eV ) 3/ 27.2
Ionisation potential( No./eV ) 4/ 46.4
Mechanical Properties
Element Value
Material condition Hard
Material condition Soft
Poisson's ratio 0.293
Poisson's ratio 0.293
Bulk modulus( GPa ) 261.2
Bulk modulus( GPa ) 261.2
Tensile modulus( GPa ) 324.8
Tensile modulus( GPa ) 324.8
Hardness - Vickers( kgf mm⁻² ) 250
Hardness - Vickers( kgf mm⁻² ) 200
Tensile strength( MPa ) 485-550
Tensile strength( MPa ) 620-690
Yield strength( MPa ) 550
Yield strength( MPa ) 415-450
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 5.7@20@20°C
Superconductivity critical temperature( K ) 0.915
Temperature coefficient( K⁻¹ ) 0.00435@0-100°C
Thermal emf against Pt (cold 0C - hot 100C)( mV ) 1.45
Physical Properties
Element Value
Boiling point( C ) 4612
Density( gcm⁻³ ) 10.22@20°C
Thermal Properties
Element Value
Melting point( C ) 2617
Latent heat of evaporation( J g⁻¹ ) 6153
Latent heat of fusion( J g⁻¹ ) 290
Specific heat( J K⁻¹ kg⁻¹ ) 251@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 138@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 5.1@0-100°C

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