Synthesis of Dense MgB2 Superconductor via In Situ and Ex Situ Spark Plasma Sintering Method
Abstract
:1. Introduction
2. Experimental Section
3. Results and Discussion
3.1. Ex Situ Synthesis
3.2. In Situ Synthesis
3.3. Microstructural Analysis
3.4. Flux Pinning Analysis
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Sample | Dwell Time (min) | Relative Density (%) | Superconducting Transition (K) Tc (onset) Tc (offset) ΔTc | Phase | ||
---|---|---|---|---|---|---|
Ex Situ | ||||||
Ex situ_1000 °C | 15 | 99 | 38.3 | 37.7 | 0.6 | Decomposition present |
Ex situ_900 °C | 15 | 99 | 38.2 | 37.7 | 0.5 | Decomposition present |
Ex situ_850 °C | 15 | 97 | 38.2 | 37.7 | 0.4 | Decomposition reduced |
Ex situ_800 °C | 15 | 92 | 38.1 | 37.7 | 0.4 | Little decomposition |
Ex situ_850 °C | 10 | 97 | 38.3 | 38.0 | 0.3 | Improved phase/little MgO |
Ex situ_850 °C | 5 | 89 | 38.1 | 37.8 | 0.3 | Improved phase/little MgO |
Ex situ_850 °C | 1 | 86 | 38.5 | 37.9 | 0.6 | Little MgO |
In Situ | ||||||
In situ_775 °C | Tubular/3 h | 66 | 38.5 | 38.1 | 0.3 | Little MgO |
In situ_775 °C | SPS/20 | 90 | 38.3 | 38.0 | 0.3 | MgO/MgB4 |
In situ_775 °C | SPS/15 | 90 | 38.4 | 38.2 | 0.2 | Little MgO |
In situ_750 °C | SPS/15 | 88 | 38.3 | 38.1 | 0.3 | Little MgO |
In situ_720 °C | SPS/15 | 83 | 38.5 | 38.3 | 0.2 | Little MgO |
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Dadiel, J.L.; Naik, S.P.K.; Pęczkowski, P.; Sugiyama, J.; Ogino, H.; Sakai, N.; Kazuya, Y.; Warski, T.; Wojcik, A.; Oka, T.; et al. Synthesis of Dense MgB2 Superconductor via In Situ and Ex Situ Spark Plasma Sintering Method. Materials 2021, 14, 7395. https://doi.org/10.3390/ma14237395
Dadiel JL, Naik SPK, Pęczkowski P, Sugiyama J, Ogino H, Sakai N, Kazuya Y, Warski T, Wojcik A, Oka T, et al. Synthesis of Dense MgB2 Superconductor via In Situ and Ex Situ Spark Plasma Sintering Method. Materials. 2021; 14(23):7395. https://doi.org/10.3390/ma14237395
Chicago/Turabian StyleDadiel, Joseph Longji, Sugali Pavan Kumar Naik, Paweł Pęczkowski, Jun Sugiyama, Hiraku Ogino, Naomichi Sakai, Yokoyama Kazuya, Tymon Warski, Anna Wojcik, Tetsuo Oka, and et al. 2021. "Synthesis of Dense MgB2 Superconductor via In Situ and Ex Situ Spark Plasma Sintering Method" Materials 14, no. 23: 7395. https://doi.org/10.3390/ma14237395