教材製作のための超伝導体づくりと評価

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  • Superconductor Fabrication and Evaluation for Teaching Materials Production
  • キョウザイ セイサク ノ タメ ノ チョウデンドウタイズクリ ト ヒョウカ

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The National Institute of Technology (KOSEN) has ensured that introduction of new ideas in science and technology is necessary in engineering education. Superconductors can be produced by sintering and blending powder samples. To produce 110 K class bismuth (Bi) high-temperature superconductors, we experimented by changing lead (Pb) substitution, sintering temperature, and mixing time. The following three steps were performed for evaluation. The Meissner effect was confirmed by cooling with liquid nitrogen. Resistance was measured using the four-terminal method. The crystal structure was evaluated using X-ray diffraction (XRD). In actual experiments, it takes a lot of time to mix the samples. In this study, we were able to produce a superconductor in a short mixing time of 30 minutes as a combination of Bi1.5 Pb0.5Sr2Ca2Cu3O10, which replaced Bi with 0.5 mol of Pb. The sample was mixed for 15 minutes followed by 15 minutes of pulverized mixing after temporary baking. This reduction in mixing time provides results that are easy to introduce into actual classes and experiments.

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