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Cadmium oxide

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. It occurs naturally as the rare mineral monteponite. Cadmium oxide can be found as a colorless amorphous powder or as brown or red crystals. Cadmium oxide is an n-type semiconductor with a band gap of 2.18 eV (2.31 eV) at room temperature (298 K).

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Further Information

Names

IUPAC nameCadmium oxide

Other names

Cadmium(II) oxide,
Cadmium monoxide

Identifiers

CAS Number: 1306-19-0

JSmol: Interactive image

ChemSpider: 14099

ECHA InfoCard: 100.013.770

EC Number: 215-146-2

PubChem: 14782

RTECS number: EV1925000

UN number: 2570

Properties

Chemical formula: CdO

Molar mass: 128.41 g·mol

Appearance: colorless powder (alpha form)
red-brown crystal (beta form)

Odor: odorless

Density: 8.15 g/cm(crystalline),
6.95 g/cm (amorphous) solid.33

Melting point: 900–1,000 °C (1,650–1,830 °F; 1,170–1,270 K)
decomposition of amorphous form

Boiling point: sublimation

Solubility in water: 4.8 mg/L (18 °C)

Solubility: ammonium

Vapor pressure: 0.13 kPa (1000 °C)
2.62 kPa (1200 °C)
61.4 kPa (1500 °C)

Band gap: 2.18 eV

Electron mobility: 531 cm/V·s

Magnetic susceptibility: -3.0·10 cm/mol−53

Thermal conductivity: 0.7 W/m·K

Refractive index: 2.49

Structure

Crystal structure: cubic

Space group: Fmm, No. 225

Lattice constant: = 4.6958 Å

Thermochemistry

Specific
heat capacity: 43.64 J/mol·K

Std molar
entropy: 55 J/mol·K

Std enthalpy of
formation: −258 kJ/mol

Gibbs free energy: -229.3 kJ/mol

Hazards

Safety data sheet: [1]

GHS pictograms:

GHS signal word: Danger

GHS hazard statements: H330 H341 H350 H361 H372 H410

GHS precautionary statements: P201 P260 P273 P281 P284 P310

NFPA 704:

Flash point: Non-flammable

median dose: 72 mg/kg (oral, rat)
72 mg/kg (oral, mouse)

median concentration: 500 mg/m (rat, 10 min)
2500 mg/m (rabbit, 10 min)
3500 mg/m (guinea pig, 10 min)
4000 mg/m (dog, 10 min)
780 mg/m (rat, 10 min)
340 mg/m (mouse, 10 min)
3000 mg/m (rabbit, 15 min)
3000 mg/m (guinea pig, 15 min)
400 mg/m (dog, 10 min)333333333

NIOSH

PEL: [1910.1027] TWA 0.005 mg/m (as Cd)3

REL: Ca

IDLH: Ca [9 mg/m (as Cd)]3

Related compounds

anions: Cadmium sulfide

cations: Zinc oxide

Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).