Microwave-assisted hydrothermal synthesis of ceria (CeO2): Microstructure, sinterability and electrical properties

resumo

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 degrees 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 (sigma(t) = 2.14 x 10(-5) S cm(-1) at 500 degrees C) after sintering at a temperature as low as 1200 degrees C.

palavras-chave

SINTERING AID; ELECTROLYTES; OXIDE; CONDUCTIVITY; BEHAVIOR; SIZE

categoria

Materials Science

autores

Carregosa, JDC; Grilo, JPF; Godoi, GS; Macedo, DA; Nascimento, RM; Oliveira, RMPB

Grupos

agradecimentos

This study was financed in part by the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) - Finance Code 001. Daniel A. Macedo and Joao P. F. Grilo acknowledges CNPq (Brazil, 431428/2018-2 and 309430/2019-4).

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