放电等离子烧结
材料科学
晶界
氮气
等离子体
烧结
大气(单位)
临界电流
电流密度
分析化学(期刊)
凝聚态物理
超导电性
冶金
微观结构
化学
热力学
核物理学
物理
有机化学
量子力学
色谱法
作者
Petre Badica,M. Burdusel,Stefan Popa,Iuliana Pasuk,I. Ivan,Hanna Borodianska,Oleg Vasylkiv,Andrei Kuncser,Adrian M. Ionescu,L. Miu,Gheorghe Aldica
标识
DOI:10.1088/0953-2048/29/10/105020
摘要
High density bulks (97%–99%) of MgB2 were prepared by spark plasma sintering (SPS) in nitrogen (N2) atmosphere for different heating rates (10, 20 and 100 °C min−1) and compared with reference samples processed in vacuum and Ar. N2 reacts with MgB2 and forms MgB9N along the MgB2 grain boundaries. The high-field critical current density is enhanced for the sample processed in N2 with a heating rate of 100 °C min−1. At 2–35 K, this sample shows the strongest contribution of the grain boundary pinning (GBP). All samples are in the point pinning (PP) limit and by increasing temperature the GBP contribution decreases.
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