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Synthesis of Dense $MgB_{2}$ Superconductor via In Situ and Ex Situ Spark Plasma Sintering Method
| Content Provider | MDPI |
|---|---|
| Author | Pawe, ł Pęczkowski Dadiel, Joseph Longji Naik, Sugali Pavan Kumar Sugiyama, Jun Ogino, Hiraku Sakai, Naomichi Kazuya, Yokoyama Warski, Tymon Wojcik, Anna Oka, Tetsuo Murakami, Masato |
| Copyright Year | 2021 |
| Description | In this study, high-density magnesium diboride $(MgB_{2}$) bulk superconductors were synthesized by spark plasma sintering (SPS) under pressure to improve the field dependence of the critical current density $(J_{c}$-B) in $MgB_{2}$ bulk superconductors. We investigated the relationship between sintering conditions (temperature and time) and $J_{c}$-B using two methods, ex situ (sintering $MgB_{2}$ synthesized powder) and in situ (reaction sintering of Mg and B powder), respectively. As a result, we found that higher density with suppressed particle growth and suppression of the formation of coarse particles of $MgB_{4}$ and MgO were found to be effective in improving the $J_{c}$-B characteristics. In the ex situ method, the degradation of $MgB_{2}$ due to pyrolysis was more severe at temperatures higher than 850 °C. The sample that underwent SPS treatment for a short time at 850 °C showed higher density and less impurity phase in the bulk, which improved the $J_{c}$-B properties. In addition, the in situ method showed very minimal impurity with a corresponding improvement in density and $J_{c}$-B characteristics for the sample optimized at 750 °C. Microstructural characterization and flux pinning $(f_{P}$) analysis revealed the possibility of refined MgO inclusions and $MgB_{4}$ phase as new pinning centers, which greatly contributed to the $J_{c}$-B properties. The contributions of the sintering conditions on $f_{P}$ for both synthesis methods were analyzed. |
| Starting Page | 7395 |
| e-ISSN | 19961944 |
| DOI | 10.3390/ma14237395 |
| Journal | Materials |
| Issue Number | 23 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-12-02 |
| Access Restriction | Open |
| Subject Keyword | Materials Ceramics Mgb2 Spark Plasma Sintering Microstructure Flux Pinning Critical Current Density Grain Connectivity |
| Content Type | Text |
| Resource Type | Article |
