Superconductor YBa2Cu3-xNixO7-delta compounds prepared by electrospinning

Author(s)

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]

Affiliation

^[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

• Document type: Journal article
• Source: MATERIALS RESEARCH EXPRESS; v. 6, n. 8 AUG 2019.
• Web of Science Citations: 1

Abstract

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)

• FAPESP's process: 09/54082-2 - Acquisition of a vibranting sample magnetometer coupled with a superconducting quantum interference device assensor (Squid-VSM) with cryogenic closed cycle
• Grantee: Ernesto Chaves Pereira de Souza
• Support Opportunities: Multi-user Equipment Program