Impact of annealing conditions on the crystal quality of hydrothermal treated gamma-AlOOH

Abstract

Among different material families, oxide hydroxides have emerged as promising cadidates for different advanced applications. In this paper, the synthesis of Boehmite (g-AlOOH) powder via the hydrothermal technique and  the influence of annealing temperature and duration on its crystal structure is reported. Different annealing temperatures (100, 200 and 300^oC) and durations (1, 2, and 3 hours) were applied on synthesized AlOOH powder. The crystal structure and crystallite size of the samples were evaluatedvia X-ray diffraction patterns. The proportion of atoms in the powder sample was ascertained utilizing Energy Dispersive X-ray Spectroscopy. The sample's molecular compositionswere meticulously investigated using Fourier-transform infrared spectroscopy. Experimental results indicate that AlOOH generated via the hydrothermal technique exhibits crystallite sizes between 8.27 nm and 15.31 nm. The 300 °C samples have the highest particle size and minimal microstrain, signifying a solid crystal structure with few imperfections.