:Cadmium oxide

{{short description|Inorganic compound with the formula CdO}}

{{chembox

| Watchedfields = changed

| verifiedrevid = 476999913

| ImageFile1 = Oxid kademnatý.JPG

| ImageFile2 = NaCl polyhedra.png

| ImageName = Cadmium oxide

| IUPACName = Cadmium oxide

| OtherNames = Cadmium(II) oxide,
Cadmium monoxide

|Section1={{Chembox Identifiers

| Abbreviations =

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 14099

| SMILES = [Cd]=O

| InChIKey = CXKCTMHTOKXKQT-MBQGENNCAM

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/Cd.O

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = CXKCTMHTOKXKQT-UHFFFAOYSA-N

| CASNo = 1306-19-0

| CASNo_Ref = {{cascite|correct|CAS}}

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = 0H3KWS8KJ3

| EINECS = 215-146-2

| PubChem = 14782

| InChI = 1/Cd.O/rCdO/c1-2

| RTECS = EV1925000

| UNNumber = 2570

}}

|Section2={{Chembox Properties

| Cd=1 | O=1

| Appearance = colorless powder (alpha form)
red-brown crystal (beta form) {{cite book|last =Patnaik|first=Pradyot|year=2003|title=Handbook of Inorganic Chemical Compounds |publisher=McGraw-Hill|isbn =0-07-049439-8|url=https://books.google.com/books?id=Xqj-TTzkvTEC}}

| Odor = odorless

| Density = 8.15 g/cm³(crystalline),
6.95 g/cm³ (amorphous){{cite web |url=https://www.cdc.gov/niosh/npg/npgd0088.html |access-date=2007-02-16 |title=NIOSH Pocket Guide to Chemical Hazards }} solid.

| MeltingPtC = 900-1000

| MeltingPt_notes =
decomposition of amorphous form

{{cite web |url=http://www.inchem.org/documents/icsc/icsc/eics0117.htm |access-date=2007-02-16 |title=INCHEM: Chemical Safety Information from Intergovernmental Organizations }}

| BoilingPtC = 1559

| BoilingPt_notes = sublimation

| Solubility = 4.8 mg/L (18 °C)

| SolubleOther = soluble in dilute acid
slowly soluble in ammonium salts
insoluble in alkalies

| pKa =

| pKb =

| ThermalConductivity = 0.7 W/m·K

| MagSus = −3.0·10⁻⁵ cm³/mol

| SpecRotation =

| RefractIndex = 2.49

| BandGap = 2.18 eV

| ElectronMobility = 531 cm²/V·s

| VaporPressure = 0.13 kPa (1000 °C)
2.62 kPa (1200 °C)
61.4 kPa (1500 °C)

}}

|Section3={{Chembox Structure

| CrystalStruct = cubic, cF8

| SpaceGroup = Fm3m, No. 225

| LattConst_a = 4.6958 Å

}}

|Section4={{Chembox Thermochemistry

| DeltaHf = −258 kJ/mol{{nist|name=Cadmium oxide|id=C1306190|accessdate=2014-05-23|mask=FFFF|units=SI}}{{cite book| author = Zumdahl, Steven S.|title =Chemical Principles 6th Ed.| publisher = Houghton Mifflin Company| year = 2009| isbn = 978-0-618-94690-7|page=A21}}

| Entropy = 55 J/mol·K

| DeltaGf = −229.3 kJ/mol{{Cite web|url=http://chemister.ru/Database/properties-en.php?dbid=1&id=500|title=Cadmium oxide}}

| HeatCapacity = 43.64 J/mol·K

}}

|Section7={{Chembox Hazards

| ExternalSDS = [https://web.archive.org/web/20121013011753/http://www.sciencelab.com/msds.php?msdsId=9923229]

| GHSPictograms = {{GHS06}}{{GHS08}}{{GHS09}}{{Sigma-Aldrich|id=202894|name=Cadmium oxide|accessdate=2014-05-23}}

| GHSSignalWord = Danger

| HPhrases = {{H-phrases|330|341|350|361|372|410}}

| PPhrases = {{P-phrases|201|260|273|281|284|310}}

| NFPA-H = 4

| NFPA-F = 0

| NFPA-R = 0

| NFPA-S =

| FlashPt = Non-flammable

| REL = Ca{{PGCH|0087}}

| PEL = [1910.1027] TWA 0.005 mg/m³ (as Cd)

| IDLH = Ca [9 mg/m³ (as Cd)]

| LD50 = 72 mg/kg (oral, rat)https://chem.nlm.nih.gov/chemidplus/rn/1306-19-0 {{Dead link|date=March 2022}}
72 mg/kg (oral, mouse)

| LC50 = 500 mg/m³ (rat, 10 min)
2500 mg/m³ (rabbit, 10 min)
3500 mg/m³ (guinea pig, 10 min)
4000 mg/m³ (dog, 10 min)
780 mg/m³ (rat, 10 min)
340 mg/m³ (mouse, 10 min)
3000 mg/m³ (rabbit, 15 min)
3000 mg/m³ (guinea pig, 15 min)
400 mg/m³ (dog, 10 min){{IDLH|7440439|Cadmium compounds (as Cd)}}

}}

|Section8={{Chembox Related

| OtherAnions = Cadmium sulfide
Cadmium selenide
Cadmium telluride

| OtherCations = Zinc oxide
Mercury oxide

| OtherCompounds =

}}

}}

Cadmium oxide is an inorganic compound with the formula CdO. It is one of the main precursors to other cadmium compounds. It crystallizes in a cubic rocksalt 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 occurs naturally as the rare mineral monteponite. Cadmium oxide can be found as a colorless amorphous powder or as brown or red crystals.Lewis, Richard J. Sr., Hawley's condensed chemical dictionary, 13th ed., 1997, p. 189 Cadmium oxide is an n-type semiconductor{{cite journal|author1=T. L. Chu |author2=Shirley S. Chu |journal=Journal of Electronic Materials|volume=19|issue=9|year=1990|pages=1003–1005|doi=10.1007/BF02652928|title=Degenerate cadmium oxide films for electronic devices|bibcode = 1990JEMat..19.1003C |s2cid=95361658 }} with a band gap of 2.18 eV (2.31 eV) at room temperature (298 K).{{cite journal |author=S. K. Vasheghani Farahani |journal=Applied Physics Letters |volume=102 |issue=2 |year=2013 |page= 022102|doi=10.1063/1.4775691|title=Temperature dependence of the direct bandgap and transport properties of CdO|display-authors=etal|bibcode = 2013ApPhL.102b2102V }}