| Texto completo | |
| Autor(es): |
Bernard, J. C.
[1]
;
Modesto, D. A.
[1]
;
Medina, M. S.
[1]
;
Zenatti, A.
[1]
;
Venancio, E. C.
[1]
;
Leite, E. R.
[2]
;
Lanfredi, A. J. C.
[1]
;
Escote, M. T.
[1]
Número total de Autores: 8
|
| Afiliação do(s) autor(es): | [1] Univ Fed ABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, Av Estados 5001, BR-09210580 Santo Andre, SP - Brazil
[2] Univ Fed Sao Carlos, Dept Quim, Lab Interdisciplinar Eletroquim & Ceram, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | MATERIALS RESEARCH EXPRESS; v. 6, n. 8 AUG 2019. |
| Citações Web of Science: | 1 |
| Resumo | |
This work describes the synthesis and characterization of YBa2Cu3-xNixO7-delta (0.00 <= x <= 0.04) compounds prepared by an electrospinning technique. Stoichiometric solutions of Y-Ba-Cu-Ni were used to electrospin nanowires of these compounds, which were dried and heat-treated at temperatures ranging from 350 degrees C to 925 degrees C in an oxygen atmosphere. All samples were characterized by x-ray diffraction (XRD), scanning electron microscopy, and temperature magnetization curves. As prepared and dried at 100 degrees C, these samples present a nanowire shape with a smooth surface, with external diameters of similar to 600 nm and a large length (>10 mu m). After the heat treatment at 780 degrees C, all of them maintain their nanowire morphology with a rough surface with external diameters of similar to 600 nm and length values ranging from 5 to 10 mu m. All samples crystallize into the perovskite structure with orthorhombic symmetry (Pmmm space group). The most intense Bragg reflections arise from the YBa2Cu3-xNixO7-delta phase and low-intensity peaks of additional phases. The temperature dependence of magnetization of these nanowires reveals a diamagnetic transition at temperatures close to the critical temperature, T-c, which is related to the superconductor transition in these compounds. The T(c )values range between 70 and 93.2 K for samples with x = 0.04 to x = 0.00, respectively, where the substitution of Cu with Ni results in a lower T-c. (AU) | |
| Processo FAPESP: | 09/54082-2 - Emu: projeto para aquisicao de um magnetometro de amostra vibrante que utiliza como sensor um dispositivo supercondutor de interferencia quantica acoplado (squid-vsm) com circuito fechado de criogenia |
| Beneficiário: | Ernesto Chaves Pereira de Souza |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Equipamentos Multiusuários |