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Formula: Se
Form: Pellet/Lump
Material: Selenium
CAS Number: 7782-49-2
Commodity: Metals
Purity: 99.999%
Maximum Lump Size: 3mm
Hazard Pictogram: GHS06, GHS08, GHS09
Selenium pellets, produced by Goodfellow, are a high-purity form of elemental selenium shaped into small cylindrical or spherical pieces. Some key properties of selenium include its semiconductor behavior and photovoltaic effect. Selenium pellets find use in applications like rectifiers, solar cells, and photocopiers. As part of Goodfellow's extensive range of metals, alloys, ceramics, polymers, composites, and other materials, these selenium pellets enable research and prototyping across a wide variety of industries.
Technical Data Sheet Safety Data Sheet Tolerance Properties

Acute toxicity

Serious health hazard

Hazardous to the environment

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Tolerances

Pellet/Lump
Maximum Lump Size Nominal

Material Properties for Metals

Atomic Properties
Element Value
Atomic number 34
Crystal structure Hexagonal
Electronic structure Ar 3d¹⁰ 4s² 4p⁴
Valences shown -2,4,6
Atomic weight( amu ) 78.96
Thermal neutron absorption cross-section( Barns ) 12.2
Photo-electric work function( eV ) 5.9
Natural isotope distribution( Mass No./% ) 76/ 9.0
Natural isotope distribution( Mass No./% ) 82/ 9.2
Natural isotope distribution( Mass No./% ) 74/ 0.9
Natural isotope distribution( Mass No./% ) 80/ 49.8
Natural isotope distribution( Mass No./% ) 77/ 7.6
Natural isotope distribution( Mass No./% ) 78/ 23.5
Atomic radius - Goldschmidt( nm ) 0.116
Ionisation potential( No./eV ) 4/ 42.9
Ionisation potential( No./eV ) 6/ 81.7
Ionisation potential( No./eV ) 5/ 68.3
Ionisation potential( No./eV ) 1/ 9.75
Ionisation potential( No./eV ) 3/ 30.8
Ionisation potential( No./eV ) 2/ 21.2
Mechanical Properties
Element Value
Hardness - Mohs 2
Material condition Polycrystalline
Poisson's ratio 0.447
Bulk modulus( GPa ) 8.3
Tensile modulus( GPa ) 58
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 12@20@20°C
Physical Properties
Element Value
Boiling point( C ) 685
Density( gcm⁻³ ) 4.79@20°C
Thermal Properties
Element Value
Melting point( C ) 217
Latent heat of evaporation( J g⁻¹ ) 333
Latent heat of fusion( J g⁻¹ ) 69
Specific heat( J K⁻¹ kg⁻¹ ) 321@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 0.5@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 37@0-100°C

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