6533b821fe1ef96bd127b943
RESEARCH PRODUCT
Experimental set up for determining the temperature-oxygen partial pressure conditions during synthesis of spinel oxide nanoparticles
B. GillotV. NivoixNadine MillotPascal PerriatD. Aymessubject
ChemistryInorganic chemistrySpinelOxideAnalytical chemistryVanadiumchemistry.chemical_elementGeneral ChemistryPartial pressureengineering.materialCondensed Matter PhysicsOxygenSoft chemistrychemistry.chemical_compoundTransition metalengineeringGeneral Materials ScienceStoichiometrydescription
Abstract Nanometric spinel oxide powders, Fe 3− x M x O 4 , where M is a transition element, have been synthetized by soft chemistry. This method generally leads to a non-stoichiometric phase, Fe 3− x M x O 4+δ where δ is the deviation from stoichiometry so that further annealing at low temperatures around 450°C and low oxygen partial pressure around 10 −25 Pa given by N 2 /H 2 /H 2 O gas mixtures is required: this enables a stoichiometric compound to be obtained and a nanometric size to be maintained. The complete set up consisting of a gas mixer, a thermogravimetric apparatus and a preparative furnace is described. Some results concerning the conditions of temperature and oxygen partial pressure leading to stoichiometry are given in the case of vanadium ferrites containing or without Co.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-11-01 |