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Formula: K
Form: Pellet/Lump
Material: Potassium
CAS Number: 7440-09-7
Commodity: Metals
Purity: 99.97%
Maximum Lump Size: 25mm
Potassium Pellets by Goodfellow are a highly reactive alkali metal available in pellet form. The metallic luster and low density of potassium make it useful for research and development purposes. Applications of potassium pellets include use as a heat transfer medium in liquid metal cooled nuclear reactors. The high thermal and electrical conductivity of potassium also enables its use in thermoelectric power generation. With their wide selection of elemental metals, Goodfellow's potassium pellets facilitate materials science research and innovation.
Technical Data Sheet Safety Data Sheet Tolerance Properties
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Tolerances

Pellet/Lump
Maximum Lump Size Nominal

Material Properties for Metals

Atomic Properties
Element Value
Atomic number 19
Crystal structure Body centred cubic
Electronic structure Ar 4s¹
Valences shown 1
Atomic weight( amu ) 39.0983
Thermal neutron absorption cross-section( Barns ) 1.8
Photo-electric work function( eV ) 2.2
Natural isotope distribution( Mass No./% ) 40/ 0.01
Natural isotope distribution( Mass No./% ) 39/ 93.26
Natural isotope distribution( Mass No./% ) 41/ 6.73
Atomic radius - Goldschmidt( nm ) 0.238
Ionisation potential( No./eV ) 2/ 31.6
Ionisation potential( No./eV ) 4/ 60.9
Ionisation potential( No./eV ) 1/ 4.34
Ionisation potential( No./eV ) 5/ 82.7
Ionisation potential( No./eV ) 3/ 45.7
Ionisation potential( No./eV ) 6/ 100
Mechanical Properties
Element Value
Hardness - Mohs 0.5
Material condition Polycrystalline @ -190C
Poisson's ratio 0.35
Bulk modulus( GPa ) 3.1
Tensile modulus( GPa ) 3.53
Electrical Properties
Element Value
Electrical resistivity( µOhmcm ) 6.8@20@20°C
Temperature coefficient( K⁻¹ ) 0.0057@0-100°C
Physical Properties
Element Value
Boiling point( C ) 760
Density( gcm⁻³ ) 0.86@20°C
Thermal Properties
Element Value
Melting point( C ) 63.25
Latent heat of evaporation( J g⁻¹ ) 2033
Latent heat of fusion( J g⁻¹ ) 61
Specific heat( J K⁻¹ kg⁻¹ ) 753@25°C
Thermal conductivity( W m⁻¹ K⁻¹ ) 102.5@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 83@0-100°C

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