Cadmium oxide
Inorganic compound with the formula CdO / From Wikipedia, the free encyclopedia
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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.[11] It occurs naturally as the rare mineral monteponite. Cadmium oxide can be found as a colorless amorphous powder or as brown or red crystals.[12] Cadmium oxide is an n-type semiconductor[13] with a band gap of 2.18 eV (2.31 eV) at room temperature (298 K).[14]
Quick Facts Names, Identifiers ...
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Names | |
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IUPAC name
Cadmium oxide | |
Other names
Cadmium(II) oxide, Cadmium monoxide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.013.770 ![]() |
EC Number |
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PubChem CID |
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RTECS number |
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UNII | |
UN number | 2570 |
CompTox Dashboard (EPA) |
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Properties | |
CdO | |
Molar mass | 128.413 g·mol−1 |
Appearance | colorless powder (alpha form) red-brown crystal (beta form) [1] |
Odor | odorless |
Density | 8.15 g/cm3(crystalline), 6.95 g/cm3 (amorphous)[2] solid. |
Melting point | 900–1,000 °C (1,650–1,830 °F; 1,170–1,270 K) decomposition of amorphous form[3] |
Boiling point | 1,559 °C (2,838 °F; 1,832 K) sublimation[3] |
4.8 mg/L (18 °C)[4] | |
Solubility | soluble in dilute acid slowly soluble in ammonium salts insoluble in alkalies |
Vapor pressure | 0.13 kPa (1000 °C) 2.62 kPa (1200 °C) 61.4 kPa (1500 °C)[5] |
Band gap | 2.18 eV |
Electron mobility | 531 cm2/V·s |
-3.0·10−5 cm3/mol | |
Thermal conductivity | 0.7 W/m·K |
Refractive index (nD) |
2.49 |
Structure | |
cubic, cF8 | |
Fm3m, No. 225 | |
a = 4.6958 Å | |
Thermochemistry | |
Heat capacity (C) |
43.64 J/mol·K[4] |
Std molar entropy (S⦵298) |
55 J/mol·K[6] |
Std enthalpy of formation (ΔfH⦵298) |
−258 kJ/mol[5][6] |
Gibbs free energy (ΔfG⦵) |
-229.3 kJ/mol[4] |
Hazards | |
GHS labelling: | |
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Danger | |
H330, H341, H350, H361, H372, H410[7] | |
P201, P260, P273, P281, P284, P310[7] | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
72 mg/kg (oral, rat)[8] 72 mg/kg (oral, mouse)[9] |
LC50 (median concentration) |
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)[9] |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
[1910.1027] TWA 0.005 mg/m3 (as Cd)[10] |
REL (Recommended) |
Ca[10] |
IDLH (Immediate danger) |
Ca [9 mg/m3 (as Cd)][10] |
Safety data sheet (SDS) | [dead link] |
Related compounds | |
Other anions |
Cadmium sulfide Cadmium selenide Cadmium telluride |
Other cations |
Zinc oxide Mercury oxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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