Microstructure and electrical conductivity of fast fired Sr- and Mg-doped lanthanum gallate

Autor(es)

Reis, S. L. ^[1] ; Muccillo, E. N. S. ^[1]

Afiliação do(s) autor(es)

^[1] Energy & Nucl Res Inst IPEN, POB 11049, BR-05422970 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 42, n. 6, p. 7270-7277, MAY 1 2016.
• Citações Web of Science: 2

Resumo

La0.9Sr0.1Ga0.8Mg0.2O3-delta solid electrolytes were consolidated by fast firing aiming to investigate the effects of the sintering method on densification, microstructure and ionic conductivity. Powder mixtures were prepared by solid state reaction at 1250 and 1350 degrees C for 12 h, and fast fired at 1450 and 1500 degrees C temperatures for 5 and 10 min. The content of impurity phases was found to be quite low with this sintering method. Relatively high density (>90% of the theoretical value) and low porosity (<1.5%) were readily obtained for powder mixtures calcined at 1250 degrees C. The activation energy for conduction was approximately 1 eV. Specimens fast fired at 1450 degrees C for 10 min with a mean grain size of 2.26 mu m reached the highest value of total ionic conductivity, 22 mS cm(-1), at 600 degrees C. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

• Processo FAPESP: 96/09604-9 - Laboratório de análise de materiais cerâmicos, metálicos e compósitos por difração de Raios X
• Beneficiário: Reginaldo Muccillo
• Modalidade de apoio: Auxílio à Pesquisa - Programa Infraestrutura - Equipamentos
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs