Electric field-assisted synthesis/sintering cerium oxide: 5 wt.% gadolinium oxide

Autor(es)

Porfirio, T. C. ^[1] ; Muccillo, E. N. S. ^[1] ; Muccillo, R. ^[1]

Afiliação do(s) autor(es)

^[1] Energy & Nucl Res Inst IPEN, Ctr Sci & Technol Mat CCTM, Travessa R 400, Cidade Univ, BR-05508170 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the European Ceramic Society; v. 41, n. 14, p. 7105-7110, NOV 2021.
• Citações Web of Science: 0

Resumo

Gadolinium oxide ceramic powders were mixed to cerium oxide ceramic powders, pressed to pellets, and sintered either at 1450 degrees C or applying 200 V cm(-1) electric field at 800 degrees C, 900 degrees C and 1000 degrees C. The structural phases and the microstructure of the sintered pellets were analyzed by X-ray diffraction and scanning electron microscopy, respectively. The formation of substitutional solid solution was followed by monitoring the increase of the electrical conductivity by impedance spectroscopy and X-ray diffraction. The main results show that Joule heating due to the flow through the pellets of the electric current, which was produced by the application of the electric field, allows for promoting partial solid solution as well as partial sintering the ceria-gadolinia pellets. Moreover, grain growth that occurred in the high temperature sintered pellets was inhibited in the electric field-assisted synthesized/sintered pellets, being an alternative technique for producing cerium oxide-gadolinium oxide solid solutions. (AU)

• Processo FAPESP: 17/11937-4 - Rota sustentável para a conversão de metano com tecnologias eletroquímicas avançadas
• Beneficiário: Fabio Coral Fonseca
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia