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<p>Nano-size SnO<sub>2</sub> added Nb<sub>3</sub>(Al, Ge) superconducting wires were fabricated using rapid heating and quenching (RHQ) combined with spark plasma sintering (SPS). After RHQ, both Nb(Al, Ge)<sub>ss</sub> and A15 phase were found in the Nb<sub>3</sub>(Al<sub>0.96</sub>Ge<sub>0.04</sub>) sample, but only A15 phase was obtained in the Nb<sub>3</sub>(Al<sub>0.92</sub>Ge<sub>0.08</sub>) sample. Following SPS sintering, all samples were transformed into a single A15 phase. Nb<sub>3</sub>(Al, Ge) superconductors show a two phase morphology with fine grain when SPS sintered at 800 ℃, and a coarse grain with homogeneous composition when sintered at 1400 ℃. The <i>J</i><sub><i>c</i></sub> of Nb<sub>3</sub>(Al<sub>0.96</sub>Ge<sub>0.04</sub>) is higher than that of Nb<sub>3</sub>(Al<sub>0.92</sub>Ge<sub>0.08</sub>), which can be attributed to the stacking faults formed during the phase transformation, providing additional flux pinning centers. Addition of nano-size SnO<sub>2</sub> enhanced the <i>J</i><sub><i>c</i></sub> of 160%-240% @4.2&#xa0;K, 6 T for the pure Nb<sub>3</sub>(Al, Ge) samples sintered at 800 ℃, whose <i>J</i><sub><i>c</i></sub> are in the magnitude of ~ 10<sup>4</sup> A/cm<sup>2</sup>; an even higher <i>J</i><sub><i>c</i></sub> enhancement of over 900% was observed in the samples sintered at 1400 ℃; however, the absolute <i>J</i><sub><i>c</i></sub> remains relatively low (~ 10<sup>2</sup> A/cm<sup>2</sup> @4.2&#xa0;K, 6 T), indicating limited practical applicability. Therefore, the samples sintered at 1400 ℃ by SPS are mainly used for basic mechanism research rather than performance optimization. Addition of SnO<sub>2</sub> might introduce nano-sized particles in the superconductors, acting as pinning centers to improve the flux pinning force.</p>

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Superconducting properties enhancement of Nb3(Al, Ge) wires by adding nano size SnO2

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Wenlong Li,
  • Zhou Yu,
  • Wentao Wang,
  • Hong Peng,
  • Yilin Wu,
  • Long Wang,
  • Yinxiang Zhou,
  • Xinyue Zhang,
  • Xiaguang Sun,
  • Jian Liu,
  • Yong Zhao

摘要

Nano-size SnO2 added Nb3(Al, Ge) superconducting wires were fabricated using rapid heating and quenching (RHQ) combined with spark plasma sintering (SPS). After RHQ, both Nb(Al, Ge)ss and A15 phase were found in the Nb3(Al0.96Ge0.04) sample, but only A15 phase was obtained in the Nb3(Al0.92Ge0.08) sample. Following SPS sintering, all samples were transformed into a single A15 phase. Nb3(Al, Ge) superconductors show a two phase morphology with fine grain when SPS sintered at 800 ℃, and a coarse grain with homogeneous composition when sintered at 1400 ℃. The Jc of Nb3(Al0.96Ge0.04) is higher than that of Nb3(Al0.92Ge0.08), which can be attributed to the stacking faults formed during the phase transformation, providing additional flux pinning centers. Addition of nano-size SnO2 enhanced the Jc of 160%-240% @4.2 K, 6 T for the pure Nb3(Al, Ge) samples sintered at 800 ℃, whose Jc are in the magnitude of ~ 104 A/cm2; an even higher Jc enhancement of over 900% was observed in the samples sintered at 1400 ℃; however, the absolute Jc remains relatively low (~ 102 A/cm2 @4.2 K, 6 T), indicating limited practical applicability. Therefore, the samples sintered at 1400 ℃ by SPS are mainly used for basic mechanism research rather than performance optimization. Addition of SnO2 might introduce nano-sized particles in the superconductors, acting as pinning centers to improve the flux pinning force.