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Cadmium oxide



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]

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)6]2+. Upon treatment with strong alkaline solutions, [Cd(OH)4]2- forms.

Health Risks

Cadmium compounds are considered carcinogenic.[1]

References

  1. ^ a b NIOSH Pocket Guide to Chemical Hazards. Retrieved on 2007-02-16.
  2. ^ a b INCHEM: Chemical Safety Information from Intergovernmental Organizations. Retrieved on 2007-02-16.
  3. ^ Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.
  4. ^ Cadmium and compounds fact sheet. Retrieved on 2007-02-16.
  5. ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Cadmium_oxide". A list of authors is available in Wikipedia.
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