Oxygen isotope exchange with subsequent time-of-flight secondary ion mass spectrometry (ToF-SIMS) is a highly valuable tool for determining oxygen diffusion coefficients in oxides. Since ToF-SIMS analysis enables an elemental and chemical mapping, it can also be used to visualize oxygen exchange-active zones by determining the local oxygen isotopic fraction. However, measuring accurate isotopic...

The catalytic properties of LaCoO3 in aqueous oxidation are explored as a function of doping. Both Sr substitution for La and Fe/Ni substitution for Co are studied. The reaction of interest is the aqueous epoxidation of crotyl alcohol with hydrogen peroxide. The reaction products are measured using GC, and the decomposition of hydrogen peroxide is studied using the volume of oxygen evolved duri...

Spin-state transitions are an important research topic in complex oxides with the diverse magnetic states involved. In particular, low-spin to high-spin transition LaCoO3 thin films has drawn a wide range of attention due emergent ferromagnetic state. Although various mechanisms (e.g., structural distortion, oxygen-vacancy formation, spin-state ordering) have been proposed, understanding what r...

This work addresses the formation of ammonia (NH3) decomposition catalysts derived from perovskites ABO3 (A = La, Ca, Sr, and B Fe, Co, Ni) precursors via operando synchrotron X‐ray diffraction experiments. During reaction in NH3, perovskite are decomposed transition metals reduced. Depending on their reduction properties, active metallic formed situ La2O3 as support. The behavior perovskites, ...

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