The spatial distribution of temperature and oxygen deficiency in spark-plasma sintered superconducting Bi-based materials

Autor(es)

Govea-Alcaide, E. ^[1] ; Perez-Fernandez, J. E. ^[1] ; Machado, I. F. ^[2] ; Jardim, R. F. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Granma, Fac Ciencias Tecn, Dept Ciencias Basicas, Bayamo - Cuba

^[2] Univ Sao Paulo, Escola Politecn, Dept Engn Mecatron & Sistemas Mecan, BR-05508900 Sao Paulo - Brazil

^[3] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PHYSICA B-CONDENSED MATTER; v. 455, p. 35-38, DEC 15 2014.
• Citações Web of Science: 1

Resumo

Pre-reacted powders of (Bi-Pb)(2)Sr2Ca2Cu3O10+ delta (Bi-2223) were consolidated by using the spark plasma sintering (SPS) technique under vacuum and at different consolidate temperatures T-D. X-ray diffraction patterns revealed that the dominant phase in all SPS samples is the Bi-2223 phase, but traces of the Bi2Sr2CaCu2O10+x (Bi-2212) phase were identified. We have found that the transport properties of SPS samples depend on their oxygen content because the SPS process is performed under vacuum. Simulations by using the finite element method (FEM) were performed for determining the actual temperature in which powders are consolidated. From these results we have inferred that SPS samples are oxygen deficient and such a deficiency is more marked near the grain boundaries, suggesting the occurrence of grains with core-shell morphology. We also argued that the width of the shell depends on the consolidation temperature, a feature corroborated by the FEM simulations. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• 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