Cadmium Oxide (CdO) Semiconductors

Topics Covered

Chemical Properties
Electrical Properties
Thermal, Mechanical and Optical Properties
Safety Information


Cadmium oxide is an inorganic compound with the chemical formula CdO. It crystallizes in cubic rocksalt lattice with anion centers and octahedral cation. It occurs naturally in the rare mineral monteponite. It can be found as brown or red crystals or colorless amorphous powder. It is an n-type semiconductor produced by burning elemental cadmium in air.


Cadmium oxide finds applications in the following:

  • Electrodes for storage batteries
  • Ceramic glazes
  • Electroplating baths
  • Pigments
  • Cadmium salts
  • Catalysts
  • Nematocide.

Chemical Properties

The chemical properties of cadmium oxide are provided in the table below:

Chemical Properties
Chemical Formula CdO
Molecular Weight 128.41
CAS No. 1306-19-0
Group Zinc – 12
Oxygen – 16
Crystal Structure Cubic
Lattice Constant 4.6953 Å

Electrical Properties

The electrical properties of cadmium oxide are provided in the table below:

Electrical Properties
Magnetic Susceptibility -0.000030
Band Gap 2.5 eV
Hole Mobility 531 cm2/Vs

Thermal, Mechanical and Optical Properties

The thermal, mechanical and optical properties of cadmium oxide are provided in the tables below:

Thermal Properties
Thermal Conductivity 0.7 W/mK
Thermal Expansion Coefficient 14x10-6 K-1
Specific Heat Capacity 43.639 J/mol K
Mechanical Properties
Density 8.15 g/cm3
Melting Point 1427°C
Boiling Point 1559°C
Optical Properties
Refractive Index 2.50

Safety Information

Safety Information
GHS Hazard Statements H301 Toxic if swallowed
H330 Fatal if inhaled
H341 Suspected of causing genetic defects
H350 May cause cancer
H361 Suspected of damaging fertility or the unborn child
H372 Causes damage to organs through prolonged or repeated exposure
H400 Very toxic to aquatic life.
Safety Precautions P201 Obtain special instructions before use
P260 Do not breathe dust/ fume/ gas/ mist/ vapors/ spray
P273 Avoid release to the environment
P281 Use personal protective equipment as required
P284 Wear respiratory protection
P310 Immediately call a POISON CENTER or doctor/ physician.

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