6533b838fe1ef96bd12a455d
RESEARCH PRODUCT
A dilatometric study of the Lao.8Sr0.2MnO3 sintering behaviour
A. PoirsonP. DecorseGilles CabocheLouis-claude Dufoursubject
Materials scienceScanning electron microscopeDiffusionAnalytical chemistrySinteringchemistry.chemical_elementMineralogyGeneral ChemistryPartial pressureCondensed Matter PhysicsOxygenGrain growthchemistryVacancy defectGeneral Materials ScienceBar (unit)description
Abstract The sintering behaviour of La0.8Sr0.2MnO3 has been studied by dilatometry between 1100 and 1800 K in various oxygen potentials [pure oxygen, air and nitrogen (PO2 = 1 × 10−5 bar)]. The starting material was prepared by spray pyrolysis of aqueous solutions of nitrates. Two classical sinter stages, neck formation and grain growth respectively, were evidenced from dilatometric curves and this result was corroborated by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses. The rate of densification was found to be directly dependent on oxygen partial pressure, the best conditions being in nitrogen. These results are discussed in terms of vacancy diffusion and oxygen stoichiometry linked to two factors: the initial (La + Sr) Mn ratio and the Mn 3+ Mn 4+ ratio determined both by temperature and oxygen partial pressure.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-08-02 | Solid State Ionics |