Cadmium oxide
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| Cadmium oxide | |
|---|---|
| IUPAC name | Cadmium oxide |
| Other names | Cadmium(II) oxide, Cadmium monoxide |
| Identifiers | |
| CAS number | [1306-19-0] |
| RTECS number | EV1925000 |
| Properties | |
| Molecular formula | CdO |
| Molar mass | 128.41 g mol-1 |
| Appearance | Red (pure) brown-black (impure) solid |
| Density | 8.150 g/cm3(Crystalline form), 6.95g/cm3 (amorphous form),[1] solid. |
| Melting point |
1427 °C (900-1000°C.[2]) |
| Boiling point |
1559 °C (Sublimates[2]) |
| Solubility in water | Insoluble |
| Solubility in acid and alkaline | degrades |
| Electron Mobility | 531 cm²/V-s |
| Magnetic susceptibility | -3e-005 cm3/mol |
| Thermal conductivity | 0.7 W/m-K |
| Structure | |
| Crystal structure | Cubic |
| Lattice constant | a = 4.6958 Å Å |
| Hazards | |
| MSDS | External MSDS Data Sheet |
| EU classification | Toxic Carc. Cat. 2 Muta. Cat. 3 Repr. Cat. 3 Dangerous for the environment |
| NFPA 704 |
 0
3
0
|
| R-phrases | R23, R24, R25, R37, R45 |
| S-phrases | S46, S39, S36, S35, S29, (S1) |
| Flash point | Non-flammable |
| Related compounds | |
| Other anions | Cadmium selenide |
| Other cations | Zinc oxide Mercury oxide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
|
Cadmium oxide is an inorganic compound with the formula CdO. CdO is one of the main precursors to other cadmium compounds It crystallizes in a cubic lattice like sodium chloride, with octahedral cation and anion centers.[3]
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[edit] Production and structure
Since cadmium compounds are often found in association with zinc ores, cadmium oxide is a common by-product of zinc refining.[4]. It is produced by burning elemental cadmium in air. Pyrolysis of other cadmium compounds, such as the nitrate or the carbonate, also affords this oxide. When pure, it is red but CdO is unusual in being available in many differing colours due to its tendency to form defect structures resulting from anion vacancies.[5]
[edit] Reactivity
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)4]2- forms.
[edit] Health Risks
Cadmium compounds are considered carcinogenic.[1]
[edit] References
- ^ a b NIOSH Pocket Guide to Chemical Hazards. Retrieved on 2007-02-16.
- ^ a b INCHEM: Chemical Safety Information from Intergovernmental Organizations. Retrieved on 2007-02-16.
- ^ Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.
- ^ Cadmium and compounds fact sheet. Retrieved on 2007-02-16.
- ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
[edit] External links
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