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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

10 to 25-fold increase in the transport superconducting critical current density of spark-plasma sintered Bi-2223 superconductors

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Govea-Alcaide, E. [1] ; Machado, I. F. [2] ; Jardim, R. F. [3]
Total Authors: 3
[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
Total Affiliations: 3
Document type: Journal article
Source: Journal of Applied Physics; v. 117, n. 4 JAN 28 2015.
Web of Science Citations: 5

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 two different temperatures T-D: 750 and 830 degrees C. The results indicate the occurrence of grains with core-shell morphology, where the shell is oxygen deficient. A post-annealing heat treatment (PAHT), performed in air, at 750 degrees C, and for a brief time interval, is responsible for a 10 to 25-fold increase in the transport superconducting current density at 77 K. The role of the oxygen-deficient shell, before and after the PAHT, was investigated by means of magnetic and transport measurements. We argue that the PAHT is two folds: (i) it is responsible for the decrease of the width of the oxygen-deficient shell, then increasing the oxygen content along the grain boundaries; (ii) it promotes the formation of conduction current paths along the grain boundaries of the SPS material. (C) 2015 AIP Publishing LLC. (AU)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC