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| Cadmium oxide | |
|---|---|
| IUPAC name | Cadmium oxide |
| Other names | Cadmium(II) oxide, Cadmium monoxide |
| Identifiers | |
| CAS number | 1306-19-0 |
| EINECS number | |
| UN number | 2570 |
| RTECS number | EV1925000 |
| Properties | |
| Molecular formula | CdO |
| Molar mass | 128.41 g mol−1 |
| Appearance | Red (pure) or brown-black (impure) solid |
| Density | 8.150 g/cm3(crystalline), 6.95 g/cm3 (amorphous)1 solid. |
| Melting point |
900-1000 °C (decomposition of amorphous form2) |
| Boiling point |
1559 °C (sublimation2) |
| Solubility in water | Insoluble |
| Solubility in acid and alkaline | degrades |
| Electron Mobility | 531 cm2/V s |
| Magnetic susceptibility | -3×10−5 cm3/mol |
| Thermal conductivity | 0.7 W/m-K |
| Structure | |
| Crystal structure | Cubic |
| Lattice constant | a = 4.6958 Å Å |
| Hazards | |
| MSDS | External MSDS |
| EU classification | Carc. Cat. 2 Muta. Cat. 3 Repr. Cat. 3 Very toxic (T+) Dangerous for the environment (N) |
| EU Index | 048-002-00-0 |
| R-phrases | R45, R26, R48/23/25, R62, R63, R68, R50/53 |
| S-phrases | S53, S45, S60, S61 |
| Flash point | Non-flammable |
| Related compounds | |
| Other anions | Cadmium sulfide Cadmium selenide Cadmium telluride |
| 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 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 It rarely occurs naturally as the mineral monteponite.
Contents |
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
Reactivity
CdO is a basic oxide and is thus attacked by aqueous acids to give solutions of [Cd(H2O)62+. Upon treatment with strong alkaline solutions, [Cd(OH)42- forms.
Health Risks
Cadmium compounds are considered carcinogenic.1 Consult MSDS.6
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.
- ^ "INDG391 - Cadmium and you - working with Cadmium - are you at risk ?" (PDF). UK Health and Safety Executive Leaflet. Retrieved on 2007-02-16.
External links
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