No estequiometria y estabilidad en agua de SrCeO<sub>3</sub> no dopado
2003; Elsevier BV; Volume: 42; Issue: 5 Linguagem: Inglês
10.3989/cyv.2003.v42.i5.635
ISSN2173-0431
AutoresGlenn C. Mather, J. R. Jurado,
Tópico(s)Ionic liquids properties and applications
ResumoStrontium cerate is the parent phase of an important class of proton-conducting perovskites with various potential technological applications.Phase formation and structure of SrCeO 3 with Sr:Ce nonstoichiometry have been investigated for the series, Sr 1±x CeO 3±δ (0.98 ≤ x ≤ 1.04).Analyses by EPMA (electron probe micro analysis) and X-ray diffraction (XRD) indicate that, for samples sintered at 1350°C, the main phase is Sr-rich for all x.The accommodation of excess SrO in the bulk phase and/or intergranular regions is discussed.The stability of nominally stoichiometric SrCeO 3 was examined in an atmosphere of high water vapour partial pressure (pH 2 O) for 2 hours, degrading to Sr(OH) 2 .H 2 O and CeO 2 for pH 2 O ≥ 3.6atm.
Referência(s)