Tricobalt tetraoxide Chemical Properties

Melting point:

895 °C (dec.)(lit.)

Boiling point:

3800°C

Density 

6.11 g/mL at 25 °C(lit.)

vapor pressure 

0Pa at 20℃

solubility 

insoluble in H2O; soluble in acid solutions, alkaline solutions

form 

powder

color 

Dark Gray

Specific Gravity

6.11

Water Solubility 

Soluble in acids and alkalis. Insoluble in water.

Merck 

14,2429

Exposure limits

ACGIH: TWA 0.02 mg/m3

InChI

InChI=1S/3Co.4O

InChIKey

LBFUKZWYPLNNJC-UHFFFAOYSA-N

SMILES

O([Co]=O)[Co]=O.O=[Co]

CAS DataBase Reference

1308-06-1(CAS DataBase Reference)

NIST Chemistry Reference

Cobalt oxide(1308-06-1)

EPA Substance Registry System

Cobalt tetraoxide (1308-06-1)

Safety Information

Hazard Codes 

Xn,T,Xi

Risk Statements 

36/37/38-40-43-49-50/53-42-52/53

Safety Statements 

26-36/37/39-45-36/37-53-61-22

RIDADR 

1477

WGK Germany 

1

RTECS 

GG2500000

TSCA 

Yes

HazardClass 

9

HS Code 

28220000

MSDS

• Language:English Provider:Cobalt (+2) cobaltic (+3) oxide

Tricobalt tetraoxide Usage And Synthesis

Description

Cobalt Oxide (II, III) is a kind oxide of cobalt. It has applications in enamels, semiconductors, grinding wheels. As an important inorganic material, it can be used in catalysis, superconductors, ceramics and other fields. It can also be used as catalyst and catalyst carrier, as electrode active material, for glass, porcelain colorants and pigments, as chemical industry oxidant and as a catalyst for organic synthesis, in senior goggles and other filter materials, in temperature and gas sensors, in electronic ceramics, in lithium ion battery electrode materials, magnetic materials, electrochromic devices, enamels, solar energy absorbers. Cobalt oxide nanoparticles can readily enter cells, and have the potential to be used for hyperthermic treatment, gene therapy and drug delivery. It is more commonly applied for energy storage such as Lithium-ion battery. It may also be used as a gas sensor in sensing toluene, acetone and some other toxic vapors.

Preparation

Tricobalt tetroxide is obtained when cobalt(II) carbonate, cobalt(II) or cobalt(III) oxide, or cobalt hydroxide oxide, CoO(OH) is heated in air at temperatures above 265°C. The temperature must not exceed 800°C (see decomposition temperature above).

Reactions

Heating above 900°C expels oxygen out of the molecule forming cobalt(II) oxide:
2Co3O4 6CoO + O2
Tricobalt tetroxide absorbs oxygen at lower temperatures, but there is no change in the crystal structure.)
The oxide is reduced to its metal by hydrogen, carbon or carbon monoxide.
Co3O4 + 4H2 3Co + 4H2O
Co3O4 + 4CO 3Co + 4CO2

Sources

https://en.wikipedia.org/wiki/Cobalt(II,III)_oxide
https://www.alfa.com/zh-cn/catalog/040184/
https://en.wikipedia.org/wiki/Cobalt_oxide_nanoparticle
https://pubchem.ncbi.nlm.nih.gov/compound/6432046#section=Top

Chemical Properties

Black fine powder

Physical properties

Black cubic crystal; density 6.11 g/cm³; decomposes above 900°C, losing oxygen; insoluble in water; soluble in acids and alkalis.

Uses

It is used in artificial photosynthesis. It is used as a magnetic semiconductor. It is also employed in supercapacitors and lithium-ion batteries.

Uses

In enamels; in semiconductors; in grinding wheels.

Flammability and Explosibility

Not classified

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