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Triiron tetraoxide

Product Name:
Triiron tetraoxide
CAS No.
1317-61-9
Chemical Name:
Triiron tetraoxide
CBNumber:
CB7752940
Molecular Formula:
Fe3O4-2
Formula Weight:
231.53
MOL File:
1317-61-9.mol
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Triiron tetraoxide Property

Melting point:
1538 °C(lit.)
Density 
4.8-5.1 g/mL at 25 °C(lit.)
refractive index 
3.0
Flash point:
7 °C
storage temp. 
2-8°C
form 
powder
color 
black
Specific Gravity
5.2
Water Solubility 
Insoluble in water and organic solvents. Soluble in concentrated mineral acids.
Merck 
14,4040
Stability:
Stable. Incompatible with strong acids, chloroformates, peroxides.
CAS DataBase Reference
1317-61-9(CAS DataBase Reference)
NIST Chemistry Reference
Iron(ii,iii) oxide(1317-61-9)
EPA Substance Registry System
Iron oxide (Fe3O4) (1317-61-9)
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Safety

Hazard Codes 
Xi,Xn,F
Risk Statements 
36/37/38-67-65-63-48/20-38-11
Safety Statements 
26-36/37/39-62-46-36/37-16
RIDADR 
UN 1294 3/PG 2
WGK Germany 
-
TSCA 
Yes
HS Code 
28211000
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N-Bromosuccinimide Price More Price(65)

Sigma-Aldrich Gold
Product number:
310069
Product name :
Iron(II,III) oxide
Purity:
powder, <5μm, 95%
Packaging:
25g
Price:
$47.7
Updated:
2020/08/18
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Sigma-Aldrich Gold
Product number:
310069
Product name :
Iron(II,III) oxide
Purity:
powder, <5μm, 95%
Packaging:
500g
Price:
$283
Updated:
2020/08/18
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Alfa Aesar Gold
Product number:
012374
Product name :
Iron(II,III) oxide, 97% (metals basis)
Packaging:
1kg
Price:
$48
Updated:
2020/06/24
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Alfa Aesar Gold
Product number:
012374
Product name :
Iron(II,III) oxide, 97% (metals basis)
Packaging:
5kg
Price:
$127
Updated:
2020/06/24
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Strem Chemicals Gold
Product number:
26-0022
Product name :
Iron(II,III) oxide (Magnetite) magnetic fluid in kerosene with oleic acid [7-9 vol%, Ms = 35-45 kA/m]
Packaging:
2ml
Price:
$136
Updated:
2020/06/24
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Triiron tetraoxide Chemical Properties,Usage,Production

Physical Properties

Black cubic crystal or amorphous powder; refractive index 2.42; density 5.17 g/cm3; Moh’s hardness 6.0; melts at 1,597°C; insoluble in water, soluble in acids.

Occurrence and Uses

Triiron tetroxide occurs in nature as the mineral magnetite, the magnetic oxide of iron. This mineral along with hematite is used as the starting material for producing iron, steel and other ferro-alloys.

Preparation

Triiron tetroxide is obtained from its natural mineral magnetite. In the laboratory the compound may be prepared by adding sodium hydroxide solution to an aqueous solution of 1:2 molar mixture of ferrous and ferric salt. (i.e., 1 mol FeCl2 + 2 mol FeCl3). The resulting black precipitate of the hydroxide on heating dehydrates to gives triiron tetroxide:
Fe2+(aq) + 2Fe3+(aq) + 8OH¯(aq) → Fe3(OH)8(s)
Fe3(OH)8(s) → Fe3O4(s) + 4H2O(g)
Also, the tetroxide may be produced by partial oxidation of iron or iron(II) sulfate by heating under limited amount of air. Another method of production involves heating iron metal with steam:
3Fe + 4H2O → Fe3O4 + 4H2

Reactions

Triiron tetroxide, when heated at elevated temperatures with a reducing agent such as hydrogen or carbon monoxide in the absence of air, produces metallic iron:
Fe3O4 + 4H2 → 3Fe + 4H2O
Partial reduction gives iron(II) oxide. When treated with concentrated acids, the tetroxide dissolves in acids forming mixtures of iron(II) and iron(III) salts:
Fe3O4 + 8HCl → FeCl2 + 2FeCl3 + 4H2O
Fe3O4 + 4H2SO4 → FeSO4 + Fe2(SO4)3 + 4H2O

Chemical Properties

solid

Chemical Properties

Magnetite (Fe3O4) constitutes the richest ore of iron; it is black and magnetic, one variety being called "lodestone".

Uses

Triiron tetraoxide can be used as pigment in paints, linoleum, ceramic glazes; in coloring glass; as a polishing compound; in the textile industry; in cathodes; as catalyst.

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Physical Properties Occurrence and Uses Preparation Reactions