Superconducting Joint for REBCO-Coated Conductors without Oxidization Annealing via Low-temperature Synthesis Reaction Using Potassium Hydroxide

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  • FUNAKI Shuhei
    Department of Physics and Materials engineering, Shimane University
  • MIYACHI Yugo
    Department of Physics and Materials engineering, Shimane University Japan Society for Promotion of Science
  • YAMADA Yasuji
    Department of Physics and Materials engineering, Shimane University

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  • 水酸化カリウムによる低温合成反応を利用した 酸素アニール処理不要なREBCO 線材の超電導接合
  • スイサンカ カリウム ニ ヨル テイオン ゴウセイ ハンノウ オ リヨウ シタ サンソ アニール ショリ フヨウ ナ REBCO センザイ ノ チョウデンドウセツゴウ

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Abstract

<p>Recently, several novel techniques for creating superconducting joints between two REBCO-CCs have been suggested. These techniques include long-time oxidization annealing to compensate the oxygen deficiency of REBCO due to the high processing temperature. In this paper, a superconducting joint was achieved via a one-time heat treatment at the low temperature of 525ºC without oxidization annealing. The jointed GdBCO-CCs were prepared in three steps. The first step is that Eu–Ba–Cu–O raw material was placed between Ag-removed Gd123 layers of the CC. In the second step, the sample was mechanical pressurized using two plates of metal. Finally, the sample was heat-treated at 525ºC in KOH vapor. All steps were performed at ambient pressure. The jointed sample was bonded finely and showed Tconset = 76.7 K and Tczero = 57.5 K inclusive of the jointed region. From XRD observation of the jointed region in the samples, both GdBCO-CC and EuBCO-pressed materials contained incomplete RE123, RE247 and RE124 phases.</p>

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