Beta form of cadmium oxide
| IUPAC name
| Other names
|Molar mass||128.413 g/mol|
|Appearance||Colorless, amourphous solid (alpha form), brown-red crystals (beta form)|
|Density||6.95 g/cm3 (amorphous), 8.15 g/cm3 (crystalline)|
|Melting point||900–1,000 °C (1,650–1,830 °F; 1,170–1,270 K) (decomposition of amorphous form)|
|Boiling point||1,559 °C (2,838 °F; 1,832 K) (sublimation)|
|0.48 mg/100 ml|
|Solubility|| Reacts with acids|
Slowly soluble in ammonium salts
Insoluble in alkalis, organic solvents
|Vapor pressure|| 0.13 kPa (1000 °C)|
2.62 kPa (1200 °C)
61.4 kPa (1500 °C)
Std enthalpy of
|Safety data sheet||Sigma-Aldrich|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
| 72 mg/kg (rat, oral)|
72 mg/kg (mouse, oral)
| Zinc oxide|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Cadmium oxide (CdO) is the extremely toxic oxide of cadmium.
CdO is a basic oxide and is thus attacked by aqueous acids to give solutions of [Cd(H2O)6]2+. Upon treatment with strong alkaline solutions, [Cd(OH)
Cadmium oxide appears as brown crystals or brown amorphous powder. It is practically insoluble in water as well as organic solvents and readily reacts with acids and bases.
Cadmium oxide can be bought from some chemical suppliers, though the compound may not available for the private individual in many countries.
Cadmium oxide can be made by oxidizing cadmium metal in air or oxygen.
Can also be obtained by calcinating cadmium hydroxide, which can be obtained by precipitating cadmium salts with an equivalent amount of sodium hydroxide.
- Make cadmium salts
- Compound collecting
- Make transparent conductive materials
- Cadmium plating
Cadmium compounds are extremely toxic and carcinogenic. Avoid making dust or aerosols when handling the compound, wear thick gloves, and work in a fume hood.
Store in clearly labeled, closed containers, preferably made of plastic, as the container will not break if dropped on the floor.
Might be accepted by hazardous waste facilities that accept old batteries due to cadmium's past use in batteries.