Uranium Dioxide (UO2) Semiconductors

Topics Covered

Chemical Properties
Electrical Properties
Thermal and Mechanical Properties
Safety Information


Uranium dioxide is an oxide of uranium produced by reducing uranium trioxide with hydrogen. It is a black, radioactive, crystalline powder that naturally occurs in the mineral uraninite. It is capable of withstanding high temperatures of about 2300°C and is resistant to radiation damage.


Uranium dioxide finds applications in the following areas:

  • Rechargeable batteries
  • Photoelectrochemical cells
  • Catalyst and radiation shielding material
  • Color glass and ceramics
  • Nuclear fuel.

Chemical Properties

The chemical properties of uranium dioxide are provided in the table below:

Chemical Properties
Chemical Formula UO2
Molecular Weight 270.03
CAS No. 1344-57-6
Group Uranium – NA
Oxygen - 16
Crystal Structure Cubic

Electrical Properties

The electrical properties of uranium dioxide are provided in the table below:

Electrical Properties
Dielectric Constant 22
Band Gap 1.3eV

Thermal and Mechanical Properties

The thermal and mechanical properties of uranium dioxide are provided in the tables below:

Thermal Properties
Heat of Formation -1084 kJ/mol
Standard Molar Entropy 78 J mol-1 K-1
Mechanical Properties
Density 10.97 g/cm3
Melting Point 2865°C

Safety Information

Safety Information
Risk Statements R26/28 - Very toxic by inhalation and if swallowed
R33 - Danger of cumulative effects
R51/53 - Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements S1/2 - Keep locked up and out of the reach of children
S20/21 - When using do not eat, drink or smoke
S45 - In case of accident or if you feel unwell seek medical advice immediately
S61 - Avoid release to the environment. Refer to special instructions/safety data sheet.

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