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Molybdenum(IV) oxide

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Products Intro: Product Name:MOLYBDENUM (IV) OXIDE
CAS:18868-43-4
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CAS:18868-43-4
Purity:Ultra Pure,For Alytical Purpose,>=99.9% Package:100g
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CAS:18868-43-4
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Products Intro: Product Name:MOLYBDENUM (IV) OXIDE
CAS:18868-43-4
Purity:99% Remarks:AAM135407
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Products Intro: Product Name:MOLYBDENUM (IV) OXIDE
CAS:18868-43-4
Purity:99% HPLC Package:1Mg ; 5Mg;10Mg ;100Mg;250Mg ;500Mg ;1g;2.5g ;5g ;10g
Molybdenum(IV) oxide Basic information
Preparation
Product Name:Molybdenum(IV) oxide
Synonyms:Molybdenum(IV) oxide, 99.95%;Molybdenum(IV)oxide(metalsbasis);MOLYBDENUM(IV) OXIDE (MOO2);Molybdenum(IV)oxide,99%;Molybdaendioxid;Molybdenum(IV) oxide, 99% (metals basis);Molybdenum(IV) oxide, 99% trace metals basis;MOLYBDENUM DIOXIDE
CAS:18868-43-4
MF:MoO2
MW:127.94
EINECS:242-637-9
Product Categories:Inorganics;Metal and Ceramic Science;Molybdenum;Oxides;metal oxide
Mol File:18868-43-4.mol
Molybdenum(IV) oxide Structure
Molybdenum(IV) oxide Chemical Properties
Melting point decomposes [JAN85]
density 6.47 g/mL at 25 °C(lit.)
form Powder
color Red-brown
Water Solubility slightly soluble H2SO4; insoluble HCl, HF, and alkalies [HAW93]
CAS DataBase Reference18868-43-4(CAS DataBase Reference)
Safety Information
Hazard Codes Xn
Risk Statements 20/21/22-36/37/38
Safety Statements 26-36
WGK Germany 1
RTECS QA4688000
TSCA Yes
HS Code 28257000
MSDS Information
ProviderLanguage
SigmaAldrich English
ALFA English
Molybdenum(IV) oxide Usage And Synthesis
PreparationMolybdenum(IV) oxide is obtained by passing steam over red hot molybdenum:
Mo + 2H2O → MoO2 + 2H2
Alternatively, the oxide may be prepared by heating a molybdate salt, such as ammonium molybdate, with a reducing agent such as zinc. The dioxide also may be obtained along with other oxides of molybdenum when molybdenum metal is heated in air.
A brown-black suspension of MoO2 in hydrate form may be obtained by reducing a solution of ammonium molybdate with hydrogen in the presence of colloidal palladium.
Chemical PropertiesLead-gray, nonvolatile powder. Dapproximately 6.4. Insoluble in hydrochloric acidand hydrogen fluoride and alkalies, sparingly solu-ble in sulfuric acid.
Physical propertiesMolybdenum(IV) oxide can be prepared by several methods including controlled oxidation of Mo and controlled reduction of MoO3 with hydrogen. The pure oxide suitable for structure determination has been prepared by electrolysis of a polymolybdate (K2O5.MoO3) solution. Molybdenum(IV) oxide is insoluble in water: it is inert in solutions of nonoxidizing acids or bases, but is dissolved by oxidizing solutions. It dissociates to Mo and MoO3 at high temperatures (~ 1100°).
Crystalline MoO2 is violet or brown. Its deformed rutile structure consists of infinite chains of MoO6 octahedra sharing opposite edges along the chain direction with Mo-Mo distances alternately long (3.10 A) and short (2.50 A). It is diamagnetic and semiconducting ; metal-metal bonds are present. Some of its thermodynamic properties are as follows: G°f29% ~ 172.415 kcal/mole H°f29% -140.5 kcal/mole S°298 11.954 gibbs/mole.
HazardToxic material.
Safety ProfilePoison by subcutaneous route. Incandescent reaction with air. When heated to decomposition it emits toxic fumes of Mo.
Molybdenum(IV) oxide Preparation Products And Raw materials
Tag:Molybdenum(IV) oxide(18868-43-4) Related Product Information
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