The effect of the sintering process on Ag–added FeSe_0.94 superconducting wire

Abstract

We investigated the effect of different sintering processes on Ag-added FeSe 0.94 superconducting wires. After applying different sintering procedures, we successfully obtained zero resistivity, at 350 • C for 100 h and at 700 • C for 1 h, in Ag-added FeSe 0.94 superconducting wire produced using the ex-situ powder-in-tube method. The crystal structure of both wires is mainly composed of the tetragonal β-FeSe phase. Ag does not react with selenium, and it can be incorporated into the crystal structure. The transport J c value of these wires is calculated to be 24.4, and 38 A cm −2 at 4.2 K in a self-field, respectively. The low current densities of the wires are attributed to the low core-density and the presence of porosity. The upper critical field is estimated to be 16.2 and 14.6 T from Werthamer-Helfand-Hohenberg theory, respectively.

Successful development of an iron-based coated conductor magnet

“…Owing to its high critical field, simple structure and the nontoxicity, 11 type IBS has attracted attention by universities and institutes around the world. Almost all researchers were devoted to the preparation and performance improvement of 11 type IBS material [20][21][22][23]. In 2023, Shanghai Jiao Tong University successfully fabricated FeSe 0.5 Te 0.5 coated conductor tapes (11 type IBS) with high transport performance of 2.79 × 10 6 A cm −2 at self-field [24].…”