Spark plasma sintering of MgB2 in the two-temperature route
Spark plasma sintering of MgB2 in the two-temperature route
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DOI：
10.1016/j.physc.2012.01.023
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发表时间：
2012-07-01
影响因子：
1.7
通讯作者：
Badica, P.
中科院分区：
文献类型：
--
作者：
Aldica, G.;Batalu, D.;Badica, P.
采用火花等离子烧结（SPS）的非原位双温方法制备了MgB2超导体。样品处理在比以前报道的更低的温度下进行。通过磁弛豫测量，与单温度途径获得的样品（相对密度为95.3%）相比，双温度途径获得的样品表现出更高的形态均匀性、更高的密度（98%以上）、更高的维氏硬度和更强的微尺度通量跳变。同时，所有烧结样品的晶粒尺寸、临界电流密度、不可逆性场、临界温度、杂质相（MgB4和MgO）的重量分数以及SPS处理过程中意外引入的碳量均近似恒定。(C) 2012 Elsevier B.V.版权所有
Superconducting bulks of MgB2 were obtained by an ex-situ two-temperature route applied to spark plasma sintering (SPS). Processing of samples was performed at lower temperatures than previously reported. Samples produced by the two-temperature route show a higher morphological uniformity, a higher density (above 98%), a higher Vickers hardness, and undesirable stronger microscale flux jumps, as indicated by magnetic relaxation measurements when compared to a sample obtained by the one-temperature route (95.3% relative density). At the same time, all sintered samples show approximately constant crystallite size, critical current density, irreversibility field, critical temperature, weight fraction of impurity phases (MgB4 and MgO), and the amount of carbon accidentally introduced during SPS processing. (C) 2012 Elsevier B.V. All rights reserved.