Characterization of ZnAl2 O4 spinel obtained by hydrothermal and microwave assisted combustion method: a comparative study

• Autor(a) principal: Melo, Marcus Antônio de Freitas
• Data de Publicação: 2017
• Outros Autores: Macedo, Heloísa Pimenta de, Melo, Dulce Maria de Araújo, Medeiros, Rodolfo Luiz Bezerra de Araújo, Medeiros, Amanda Lucena de, Figueredo, Gilvan Pereira de, Oliveira, Ângelo Anderson Silva de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/45287
• 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