Low-temperature sintering to fabricate MgB2 by using Mg(BH4)2 as precursor
| Autor: | Ruijuan Nie, Xinwei Cai, Zigeng Huang, Wenhao Luo, Dan Xi, Qingrong Feng, Furen Wang, Zizhao Gan, C. Q. Guo |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Superconductor Science and Technology. 34:075007 |
| ISSN: | 1361-6668 0953-2048 |
| DOI: | 10.1088/1361-6668/abff70 |
| Popis: | Low-temperature sintering to fabricate MgB2 is considered a promising method because it reduces the formation of MgO and reduces the grain size, thereby increasing the critical current density. Chemical doping, ball milling of precursor and modifying the Mg source in precursor for low-temperature sintering have all been carefully investigated. However, the threshold of sintering temperature have been kept near 500 °C. A new in-situ method to low-temperature sintering using Mg(BH4)2 as a precursor is presented in this paper. Mg(BH4)2 decomposes into highly reactive nanoscale Mg and B in a molar ratio of 1:2 without impurities. In this method, only 2 h of sintering at 400 °C is required to completely react Mg with B to produce MgB2, and after 54 h sintering, the sample has comparable J C to the normal MgB2 from solid-state reaction method sintered at 800 °C. The sample sintered at 500 °C give better J C than normal MgB2 under both high and low magnetic field. |
| Databáze: | OpenAIRE |
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