article
Microwave-assisted hydrothermal synthesis of ceria (CeO2): microstructure, sinterability and electrical properties
Registro en:
0272-8842
10.1016/j.ceramint.2020.06.021
Autor
Nascimento, Rubens Maribondo Do
Carregosa, João Domingos Covello
Grilo, João Paulo de Freitas
Godoi, Glauber Silva
Macedo, Daniel Araújo de
Oliveira, Rosane Maria Pessoa Betânio
Resumen
This work reports the microstructural (XRD/SEM), dilatometric and electrical characterization (impedance
spectroscopy) of ceria (CeO2) obtained by microwave-assisted hydrothermal synthesis under mild conditions
(T = 120 °C and short reaction times of 10 and 20 min). The as-prepared and calcined powders show characteristic diffraction peaks of the cubic fluorite-type structure of cerium oxide. A remarkable sinterability allows obtaining dense ceramics (relative densities exceeding 95%) with enhanced electrical properties
(σt = 2.14 × 10−5 S cm−1 at 500 °C) after sintering at a temperature as low as 1200 °C 2030-12