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

• Autor(a) principal: Macedo,Heloísa Pimenta de
• Data de Publicação: 2017
• Outros Autores: 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
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Materials research (São Carlos. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392017000800029
• topic: Zinc Aluminate; Hydrothermal Method; Microwave Assisted Combustion

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.