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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.)

Highly dense and textured superconducting (Bi,Pb)(2)Sr2Ca2Cu3O10+delta ceramic samples processed by spark-plasma texturing

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Perez-Acosta, L. [1] ; Govea-Alcaide, E. [2] ; Noudem, J. G. [3, 4] ; Machado, I. F. [5] ; Masunaga, S. H. [6] ; Jardim, R. F. [6]
Total Authors: 6
[1] Univ Camaguey, Fac Electromecan, Dept Fis, Circunvalac Norte Km 5 1-2s-N, Camaguey - Cuba
[2] Univ Granma, Fac Ciencias Nat & Exactas, Dept Fis Matemat, Apdo 21, POB 85100, Bayamo - Cuba
[3] CNRS UMR 6508 ENSICAEN CNRS, CRISMAT LUSAC Lab, 6 Bd Marechal Juin, F-14050 Caen 04 - France
[4] Univ Caen Basse Normandie, 6 Bd Marechal Juin, F-14050 Caen 04 - France
[5] Univ Sao Paulo, Escola Politecn, Dept Engn Mecatron & Sistemas Mecan, BR-05508900 Sao Paulo, SP - Brazil
[6] Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Sao Paulo, SP - Brazil
Total Affiliations: 6
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 42, n. 11, p. 13248-13255, AUG 15 2016.
Web of Science Citations: 4

Consolidated powders of the superconducting cuprate Bi1.65Pb0.35Sr2Ca2Cu3O10+delta (Bi-2223) by the spark-plasma texturing (SPT), spark-plasma sintering (SPS), and the traditional solid-state reaction method were investigated by several techniques and their features compared. The results show that SPT samples exhibit a higher degree of texture, as inferred by a Lotgering factor of similar to 0.73 along the {[}001] direction and a relative density of 96% of the theoretical value. From magnetic hysteresis loops M vs. H at 5 K, the intragranular critical current densities along two applied magnetic field orientations, J(c0)(c) and J(c0)(ab) relative to the compacting pressure direction, were determined. The anisotropy factor, gamma(J)=J(c0)(ab)/J(c0)(c), yielded an estimate of similar to 2 in the SPS sample and similar to 19 for samples obtained via the SPT method. In the latter samples, J(c0)(c) at 5 K is close to 1.3 x 10(8) A/cm(2), a value higher than others found for the same compound. The temperature dependence of the electrical resistivity, rho(T), analyzed within the framework of a current conduction model for granular superconductors, supports the higher degree of texture of SPT samples and indicates changes in the oxygen content when samples are subjected to a post-annealing heat treatment. All the results reveal the promising capabilities of the SPT method for improving volume density, texture, and grain boundary connectivity of superconducting Bi-2223 materials. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

FAPESP's process: 14/19245-6 - Search for novel superconducting materials
Grantee:Renato de Figueiredo Jardim
Support type: Scholarships abroad - Research
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