Effect of the preparation route on the structure and microstructure of LaCoO3

Abstract

Lanthanum cobaltite oxide, LaCoO3, was prepared by the evaporation technique and the amorphous metal complex method. Powders were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and surface area measurements. The effect of the synthesis route on the phase purity, particle size, surface area, and morphology of the powders was studied. A single perovskite phase was synthesized at 700°C using the amorphous metal complex route. However, the evaporation technique required higher temperature for LaCoO3 crystallization. Based on the characterization results, low temperature formation of LaCoO3 was attributed to the homogeneity of the precursors. Such behavior also results in different microstructures. Powder synthesized by the amorphous metal complex method exhibited the highest surface area and the lowest particle size.

Low-Temperature Spin-Canted Magnetism and Bipolaron Freezing Electrical Transition in Potential Electron Field Emitter NdNiO3

“…Some tiny peaks in the mid wavenumber region at 1370, 1510, and near 2920 cm –1 are observed due to C–H bending, CC–C, and C–H stretching vibration from the residue of organic combustion, respectively. The tiny peaks at 481 and 489 cm –1 (pinpointed in Figure b with black arrows) are associated with Nd–O–Ni and Ni–O–Nd coupling vibrations, which further reinforced the strong bonding between atoms in the orthorhombic system. , The surface morphology of NdNiO 3 used for the field emission study is displayed in Figure c,d, and it exposed microporous network-like images with an enriched conducting channel. This channel-like morphology is advantageous for productive field emission properties …”

Evaluación del cerámico con estructura tipo perovskita LaFe0,2Co0,8O3 / Evaluation of the perovskite LaFe0.2Co0.8O3

“…La señal presente a 3430 cm −1 se puede asociar a modos vibracionales de tensión del enlace O-H de grupos hidroxilos. A 2892 cm −1 se observa una banda asociada al modo de tensión del enlace O-H de ácidos carboxílicos [18][19]. Las bandas ubicadas hacia 2344 y 2358 cm −1 , corresponden con modos de tensión asociados a la presencia de CO 2 , Así mismo, la señal ubicada a 1585 cm −1 , puede asociarse al modo de tensión C=O.…”

Perovskite ceramics and recent experimental progress in reactor design for chemical looping combustion application

“…The properties of perovskite materials are highly dependent on their preparation method; as a result, several methods of synthesis have been introduced for perovskite production to date which strongly influence their surface physicochemical properties, surface area, porosity, purity and stability and crystal size (Voorhoeve et al, 1977;Zhu et al, 2010a). Of all the proposed techniques, the solid state reaction, the sol-gel method, the combustion method, mechanical-chemical processing, the Pechini method and the microwave route are the most common (Andoulsi et al, 2014).…”