Characteristics of Perovskites ReNiO₃ (Re = La and Nd) Prepared by Solid State Reaction in the Ambient of Oxygen

Abstract

In the proposed method, we could complete the synthesis with only 3 h of thermal treatment, which is relatively fast in comparison to the previously reported procedure, without an expensive gascontrolled chamber system. The compound comprises Re2O3 and NiO3 powders that were mixed thoroughly in a stoichiometric ratio in a ball mill for 24 h and then dried in an oven at a 100 °C. The powder mixture was quickly calcined at various temperature for at least 3 h in an oxygen gas flow compared to conventional annealing method. After calcination at 1100 °C, the detected XRD peaks matched well with peaks of the standard ABO3 perovskite structure. Moreover, EDX and FT-IR spectral analysis results confirmed that the mixture had formed stoichiometry ReNiO3. All prepared samples comprised plate-like grains with a random orientation, and their average particle size was in the range of 1 to 3 μm calculated from FE-SEM images.

Z-Scheme LaCoO3/g-C3N4 for Efficient Full-Spectrum Light-Simulated Solar Photocatalytic Hydrogen Generation

“…Perovskite-type semiconductor materials are promising photocatalysts due to their tunable band gaps, strong resistance to photocorrosion, and sufficient oxygen vacancies. − Because of these characteristics, they are very promising materials for solar cells and photocatalytic reactions and have attracted considerable attention from researchers. ,− The formation of a heterojunction with g-C 3 N 4 was expected to improve the photocatalytic performance of g-C 3 N 4 and perovskite. This strategy reduces the recombination of electrons and holes, enhances charge separation, and improves the overall photocatalytic activity.…”

Ambient pressure synthesis of unstable bulk phases of strongly correlated rare-earth nickelates

“…Table 1 summarizes the reported experimental conditions commonly employed for the synthesis of several bulk nickelate phases. The near-ambient pressure syntheses of bulk and nanostructured La-, 21 Pr- 22 and Nd [23][24][25] -doped RNiO 3 have been reported through several techniques, such as the solid-state flux method, 21 solid-state nitrate annealing, 22 sol-gel precipitation and annealing, 23 electrospinning, 26 and hydrothermal synthesis. 25 However, no report exists for the low-pressure synthesis of nickelates with rare earth elements past Nd in the lanthanide series (such as Sm, Eu, etc.).…”

Synthesis of Ce0.1La0.9MnO3 Perovskite for Degradation of Endocrine-Disrupting Chemicals under Visible Photons

“…Recently, perovskite-type oxides have been probed as alluring catalysts for solar cells, photocatalysis, electrode materials in batteries, etc. on account of their affordability, ease of fabrication, exceptional physicochemical properties, thermal stability, configurable bandgaps, adequate oxygen vacancies, and substantial resistance to photo corrosion [44,45]. Crystalline perovskites with formula ABO 3 have 12-coordinated rare-earth or alkalineearth metals at the A site and a transition metal BO 6 octahedra.…”