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Actinium: physical properties

Temperatures

• Melting point: 1323 [or 1050 °C (1922 °F)] K
• Boiling point: 3573 [or 3300 °C (5972 °F)] K (liquid range: 2250  K
• Critical temperature: no data  K
• Superconduction temperature: no data  K

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Expansion and conduction properties

• Thermal conductivity: 12  W m^-1 K^-1
• Coefficient of linear thermal expansion: no data  x 10^-6 K^-1

Bulk properties

• Density of solid: 10070  kg m^-3
• Molar volume: 22.55  cm³
• Velocity of sound: no data  m s^-1

Elastic properties

• Youngs modulus: no data  GPa
• Rigidity modulus: no data  GPa
• Bulk modulus: no data  GPa
• Poissons ratio: no data  (no units)

Hardnesses

• Mineral hardness: no data  (no units)
• Brinell hardness: no data  MN m^-2
• Vickers hardness: no data  MN m^-2

Electrical properties

• Electrical resistivity: no data  10^-8 Ω m; or mΩ cm

Optical properties

• Reflectivity: no data  %
• Refractive index: no data  (no units)

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