EPJ Web of Conferences 29, 00016 (2012)
https://doi.org/10.1051/epjconf/20122900016

Synthesis and characterization of lanthanum monoaluminate by co-precipitation method

¹ Laboratory of Molecular chemistry and environment, University of Med Khider Biskra, Algeria
² Laboratory of Molecular chemistry and environment, University of Med Khider Biskra, Algeria

^a e-mail: djoudi_lynda@yahoo.fr

Abstract

Our contribution has focused on the synthesis and characterization of lanthanum monoaluminate LaAlO3 by the method of co-precipitation. The powder was successfully synthesized using NaOH, La (NO₃)_3.6H₂O and Al (NO₃)_3.9H₂O as raw materials by this method and calcined at different temperatures. It was characterized by several techniques: Fourier transform infrared spectroscopy (FT-IR), thermogravimetric and differential thermal analysis (TGA/DTA), X-ray diffraction (XRD) and laser diffusion. All the results for physico-chemicals characterizations show that the crystallization temperature of the LaAlO₃ precursor gels precipitated is estimated as 790 °C by TG/DTA. The XRD pattern of the LaAlO₃ precursor gels calcined at 700 °C for 6 h has a perovskite structure of rhombohedral hexagonal phase formed and the presence of crystalline impurities is not found. The crystallite size of LaAlO₃ slightly increases from 31to 44.5 nm with calcination temperature increasing from 700to1000 °C for 6 h.