Structural and morphology comparison between m-LaVO<inf>4</inf> and LaVO<inf>3</inf> compounds prepared by sol-gel acrylamide polymerization and solid state reaction

Abstract:

We contrast the production of LaVO3 polycrystalline samples obtained by reduction of m-LaVO4 prepared by sol-gel acrylamide polymerization (SGAP) and solid state reaction (SSR). For SGAP the formation of m-LaVO4 occurs at 400 °C, for SSR at 1400 °C. For m-LaVO4-SGAP we observe a homogeneous morphology with needle-shaped grains of 50 nm average size. The SSR presents a broader size distribution in the micrometer range. Both m-LaVO4 samples were reduced into LaVO3 using a Zr rod at 850 °C in vacuum. LaVO3-SGAP presents a homogeneous grain distribution with an average size of 745 nm. LaVO3-SSR has an average size of 3.45 μm. The stoichiometry of all compounds was confirmed by energy dispersive X-ray spectroscopy. X-ray powder diffraction and transmission electron microscopy give crystal structures in agreement with those reported in the literature. © 2009 Elsevier B.V. All rights reserved.

Año de publicación:

2009

Keywords:

• X-Ray diffraction
• Atomic force microscopy (AFM)
• ceramics
• Sol-gel processes
• Microstructure

Fuente:

scopus