| Texto completo | |
| Autor(es): |
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]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [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
Número total de Afiliações: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CERAMICS INTERNATIONAL; v. 42, n. 11, p. 13248-13255, AUG 15 2016. |
| Citações Web of Science: | 4 |
| Resumo | |
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) | |
| Processo FAPESP: | 14/19245-6 - Procura por novos materiais supercondutores |
| Beneficiário: | Renato de Figueiredo Jardim |
| Modalidade de apoio: | Bolsas no Exterior - Pesquisa |
| 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 |