Trimanganese tetraoxide

Trimanganese tetraoxide Basic information
Physical Properties Occurrence and Use Preparation Reactions
Product Name:Trimanganese tetraoxide
Synonyms:Manganese(II,IV) oxide;hydroxy(keto)manganese;hydroxy(oxo)manganese;Trimanganese tetraox;Manganese (II,III) oxide , 97 %≥97%;trimanganese tetraoxide;MANGANESE OXIDE;MANGANESE TETROXIDE
CAS:1317-35-7
MF:Mn3O4-2
MW:228.81
EINECS:215-266-5
Product Categories:metal oxide;Manganese;Inorganics;Metal and Ceramic Science;Oxides
Mol File:1317-35-7.mol
Trimanganese tetraoxide Structure
Trimanganese tetraoxide Chemical Properties
Melting point 1705°C
density 4.8 g/mL at 25 °C(lit.)
vapor pressure 0Pa at 25℃
form Powder
color brown
Specific Gravity4.856
Water Solubility insoluble H2O [KIR81]; soluble HCl, releasing Cl2 [MER06]
Merck 13,5759
Stability:Stable.
CAS DataBase Reference1317-35-7(CAS DataBase Reference)
EPA Substance Registry SystemManganese tetraoxide (1317-35-7)
Safety Information
Hazard Codes Xi
Risk Statements 36/37/38
Safety Statements 26-36
WGK Germany 2
RTECS OP0895000
Toxicitymouse,LC,inhalation,> 3608ug/m3/2H (3.608mg/m3),American Industrial Hygiene Association Journal. Vol. 41, Pg. 494, 1980.
MSDS Information
ProviderLanguage
SigmaAldrich English
Trimanganese tetraoxide Usage And Synthesis
Physical PropertiesBlack tetragonal crystal; exhibits two allotropic modifications—a stable alpha phase, occurring in tetragonal crystalline form (as hausmannite) and an unstable beta modification; Moh’s hardness 5.5; insoluble in water; soluble in hydrochloric acid.
Occurrence and UseManganese(II,III) oxide occurs in nature as the mineral hausmannite [1309-55-3]. It is used to make ferrites and thermistors. The oxide also is used in the thermite process for producing manganese.
PreparationManganese(II,III) oxide is made by heating manganese(IV) oxide, MnO2, or manganese(III) oxide, Mn2O3, above 950°C. When Mn2O3 is heated in air, the temperature should be above 940°C, but if heated in oxygen, the temperature should be above 1,090°C. Also, heating manganese(III) oxide at 230°C in hydrogen yields Mn3O4. However, further heating above 300°C converts Mn3O4 formed to green manganese(II) oxide, MnO.
Manganese(II,III) oxide also is obtained by heating the dioxide, MnO2, with carbon at 600 to 700°C.
ReactionsManganese(II,III) oxide reacts with dilute acids forming the corresponding manganous salt and manganese(IV) oxide, MnO2:
Mn3O4 + 2H2SO4 → 2MnSO4 + MnO2 + 2H2O
The oxide, however, dissolves slowly in cold sulfuric acid forming a red solution that also contains manganic sulfate, Mn2(SO4)3:
Mn3O4 + 4H2SO4 → MnSO4 + Mn2(SO4)3 + 4H2O
Reaction with acetic acid yields manganese(II) acetate and manganese(III) oxide:
Mn3O4 + 2CH3COOH → Mn(CH3COO)2 + Mn2O3 + H2O
Manganese(II,III) oxide is reduced to manganese metal when heated with powdered aluminum (the Thermite process). The reaction is vigorous and exothermic:
3Mn3O4 + 8Al → 4Al2O3 + 9Mn






Chemical PropertiesGrass-green powder. but converted to Mn 3O4 if heated in air. Soluble in acids; insoluble in water. Noncombustible.
UsesTextile printing, analytical chemistry, catalyst in manufacture of allyl alcohol, ceramics, paints, colored glass, bleaching tallow, animal feeds, fertilizers, food additive and dietary supplement.
General DescriptionManganese(II,III) oxide is a transition metal oxide that is formed by annealing manganese oxide in the air above 1000°C. It can be used for a variety of applications such as catalysis, electrochromic devices, and other energy storage applications.
Reactivity ProfileTrimanganese tetraoxide is non-combustible but decomposes, generating toxic fumes when strongly heated strongly in the air. A good oxidizing agent. Reacts with hydrochloric acid to form gaseous chlorine and soluble manganese salts.
HazardChronic manganese poisoning and pulmonary effects.
Health HazardManganese tetroxide affects the central nervous system, and toxicity occurs mostly in chronic form (manganism).
Flammability and ExplosibilityNonflammable
Safety ProfileExperimental reproductive effects. Reacts violently @ <l00℃. See also MANGANESE COMPOUNDS.
Manganese oxide (MnO2),Manganese(Ⅳ)oxide,BLACK MANGANESE OXIDE MANGANESE (II) OXIDE Tricobalt tetraoxide ETHYLENE OXIDE (Diethoxymethyl)diphenylphosphine oxide Iron oxide Zinc oxide Magnesia ore Trimanganese tetraoxide NITRIC OXIDE Manganese NITROUS OXIDE Silicon Manganese MANGANESE STEARATE Magnesium oxide Manganese sulfate Cuprous oxide Propylene oxide

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