Characterization of ZnAl2O4 Spinel Obtained by Hydrothermal and Microwave Assisted Combustion Method: A Comparative Study

AUTOR(ES)

Macedo, Heloísa Pimenta de, Medeiros, Rodolfo Luíz Bezerra de Araújo, Medeiros, Amanda Lucena de, Oliveira, Ângelo Anderson Silva de, Figueredo, Gilvan Pereira de, Melo, Marcus Antônio de Freitas, Melo, Dulce Maria de Araújo

FONTE

Mat. Res.

DATA DE PUBLICAÇÃO

02/05/2017

RESUMO

In this work, zinc aluminate spinel was prepared by two methods of directly synthesis (without calcination): microwave assisted combustion and hydrothermal method. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and N2-adsorption/desorption isotherms. The XRD patterns confirmed the formation of cubic ZnAl2O4 spinel structure with no secondary phases for both synthesis routes, whereas the hydrothermal method yielded powders with crystallite size 3 times smaller (6.9 nm), as compared to the powders produced by microwave assisted combustion method (25.6 nm). The micrographs revealed agglomerated powders with plate-like morphologies for both routes. Nitrogen adsorption/desorption isotherms (BET) revealed higher surface area (183 m2.g-1) and greater pore volume (0.173 cm3.g-1) for ZnAl2O4 powders prepared by the hydrothermal method.

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