Oxygen vacancy formation and annihilation in lanthanum cerium oxide as a metal reactive oxide on 4H-silicon carbide

Abstract

A mechanism regarding the redox reaction in lanthanum cerium oxide (LaxCeyOz) post-deposition annealed in reducing and oxidizing atmosphere was schematized and discussed in association with the presence of lanthanum as a substitutional cation. Analyses have been performed using X-ray diffraction, energy-filtered transmission electron microscopy, scanning transmission electron microscope-energy dispersive spectroscopy line scan, and capacitance-voltage measurements. The results showed the presence of an oxygen vacancy when La(3+) was in its substitution site, while annihilation of oxygen vacancy was accompanied by a displacement of La(3+) from the substitutional site to the interstitial site via a kick-out mechanism prior to its disappearance from the CeO2.

Porous Quaternary Al0.1In0.1Ga0.8N Film Formation via Photoelectrochemical Etching in HF:C2H5OH Electrolyte

“…. The acquisition of a larger c (0.5212–0.5220 nm) than the GaN (0.5185 nm) signified the occurrence of lattice expansion in the nonporous film . In comparison, larger c values were obtained by the films etched in 1:1 and 1:2 solution while the films etched in 1:3 and 1:4 solution showed smaller c values than the nonporous film (inset of Fig.…”

Insight into the Effect of Oxygen Vacancy Concentration on the Catalytic Performance of MnO2

“…Beside the above approaches, introducing oxygen vacancies (OVs) is a relatively simple and economic alternative for developing high-performing electrocatalysts. [28][29][30] Depending on the sample treatment, thermal heating or radiation, OVs can be created in the bulk of and at the surface of metal oxides. [31][32][33][34][35] Kong 34 and Yan 35 et al reported that tuning the relative concentration ratio of bulk OVs to surface OVs in TiO 2 can enhance the photocatalytic efficiency.…”

Influence of isovalent and aliovalent dopants on the reactivity of cerium oxide for catalytic applications

“…Since, bivalent doped ceria materials are thermally unstable, and phase segregation occurs which makes the oxygen migration more difficult. This consideration has shrunk down to select trivalent cations as dopants in the aliovalent section to improve the ceria catalytic properties [26].…”