Cadmium oxide

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IUPACName = Cadmium oxide
OtherNames = Cadmium(II) oxide,
Cadmium monoxide
Section1 = Chembox Identifiers
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CASNo = 1306-19-0
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RTECS = EV1925000
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Section2 = Chembox Properties
Cd = 1 | O = 1
Appearance = Red (pure) brown-black (impure) solid
Density = 8.150 g/cm³(Crystalline form), 6.95g/cm³ (amorphous form),cite web |url=http://www.cdc.gov/niosh/npg/npgd0088.html |accessdate=2007-02-16 |title=NIOSH Pocket Guide to Chemical Hazards |format= |work= ] solid.
MeltingPt = 1427 °C
Melting_notes = 900-1000°C.cite web |url=http://www.inchem.org/documents/icsc/icsc/eics0117.htm |accessdate=2007-02-16 |title=INCHEM: Chemical Safety Information from Intergovernmental Organizations |format= |work= ]
BoilingPt = 1559 °C
Boiling_notes = Sublimates [http://www.inchem.org/documents/icsc/icsc/eics0117.htm Cadmium Oxide (Icsc) ] ]
Solubility = Insoluble
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SolubleOther = degrades
Solvent = acid and alkaline
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ThermalConductivity = 0.7 W/m-K
MagSus = -3e-005 cm³/mol
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ElectronMobility = 531 cm²/V-s
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Section3 = Chembox Structure
CrystalStruct = Cubic
LattConst_a = 4.6958 Å
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Section4 = Chembox Thermochemistry
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Section6 = Chembox Explosive
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Section7 = Chembox Hazards
ExternalMSDS = [http://physchem.ox.ac.uk/MSDS/CA/cadmium_oxide External MSDS Data Sheet]
EUClass = Toxic Carc. Cat. 2 Muta. Cat. 3 Repr. Cat. 3 Dangerous for the environment
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NFPA-H = 3
NFPA-F = 0
NFPA-R = 0
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RPhrases = R23, R24, R25, R37,
R45
SPhrases = S46, S39, S36, S35,
S29, S1
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FlashPt = Non-flammable
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Section8 = Chembox Related
OtherAnions = Cadmium selenide
OtherCations = Zinc oxide Mercury oxide
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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. [Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.] It rarely occurs naturally as the mineral monteponite.

Production and structure

Since cadmium compounds are often found in association with zinc ores, cadmium oxide is a common by-product of zinc refining. [cite web |url=http://www.npi.gov.au/database/substance-info/profiles/17.html |title=Cadmium and compounds fact sheet |accessdate=2007-02-16 |format= |work= ] . 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. [Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.]

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. Consult MSDS.cite web |url=http://www.hse.gov.uk/pubns/indg391.pdf |title=INDG391 - Cadmium and you - working with Cadmium - are you at risk ?|accessdate=2007-02-16 |format=PDF |work=UK Health and Safety Executive Leaflet ]

References

External links

* [http://www.webelements.com/webelements/compounds/text/Cd/Cd1O1-1306190.html Cadmium(II) oxide information at Webelements] .