Surface Praseodymium Species on MgO: Characterization and Activity for Oxidative Coupling of Methane

Baronetti, Graciela T.; Grosso, Walter E.; Maina, Silvia P.; Padró, C.L.; Castro, Alberto A.; Scelza, Osvaldo A.; Latasa, J. M. Palacios

doi:10.1002/(sici)1097-4660(199710)70:2<141::aid-jctb742>3.0.co;2-o

Cited by 3 publications

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“…The XPS 3d spectra of Pr in (Ce,Pr,Sm)O and (Ce,La,Pr,Sm,Y)O resemble the one obtained for Proxide confirming that oxidation state of Pr is the same in all powders. Comparing the XPS data for Pr-oxide obtained in this work (Figure 2(b)) to the one reported in the literature, [27,28] the spectra indicate the presence of Pr 4+ rather than Pr 3+ , but mixed oxidation state [29] cannot be excluded. At present, based on XRD data (see SI, Figure S2b and S2c), it can only be assumed that Pr is most probably present in mixed oxidation state (Pr 4+ and Pr 3+ ).…”

Section: Microstructure and Element Compositionsupporting

confidence: 75%

Multicomponent equiatomic rare earth oxides

Djenadic

Sarkar

Clemens

et al. 2016

Materials Research Letters

260

172

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Multicomponent rare earth oxide (REO) nanocrystalline powders containing up to seven equiatomic rare earth elements were successfully synthesized in a single-phase CaF 2-type (Fm-3 m) structure. The addition of more than six elements resulted in the formation of a secondary phase. Annealing at 1000°C for 1 h led to the formation of a single-phase (Ia-3) even in the 7-component system. In the absence of cerium (Ce 4+), secondary phases were observed irrespective of the number of cations or the extent of thermal treatment indicating that cerium cations played a crucial role in stabilizing the multicomponent REOs into a phase pure structure. IMPACT STATEMENT Multicomponent equiatomic rare earth oxides pioneer a new group of materials that crystallize into a single-phase structure with the dominant role of a single element instead of entropy.

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Section: Microstructure and Element Compositionsupporting

confidence: 75%