Improved flux pinning through Ce–Mg additions in melt textured YBa2Cu3O7−δ
Improved flux pinning through Ce–Mg additions in melt textured YBa2Cu3O7−δ
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通过在熔体织构 YBa2Cu3O7−δ 中添加 Ce-Mg 改善助焊剂钉扎
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
J. Fultz
中科院分区：
文献类型：
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作者：
P. McGinn;S. Yeung;A. Banerjee;J. Fultz
研究了CeO_2和BaCeO_3复合添加对熔融织构YBa2Cu3O7−δ磁性能的影响。与单独添加或不添加的样品相比，添加导致了YBa2Cu3O7−δ的磁性能的改善。Ce-Mg的添加组合在磁滞回线中产生了“峰值效应”，而没有明显的T_c退化。推测这是由于形成了一种新型的钉扎中心。Ce和Mg离子都被认为替代了YBa2Cu3O7−δ晶格，产生了缺陷，在磁滞回线中产生了峰值效应。单独添加镁会导致T_c降低，而Ce的加入会使T_c恢复并提高峰的大小。
The effects of Ce-based additions (CeO2 and BaCeO3) in combination with MgO additions on the magnetic properties of melt textured YBa2Cu3O7−δ have been investigated. The additions lead to improvements in the magnetic properties of YBa2Cu3O7−δ compared to samples with either addition alone or with no additions. The Ce–Mg addition combination produces a “peak effect” in the magnetic hysteresis loop without significant Tc degradation. This is postulated to be due to the formation of a new type of pinning center. Both Ce and Mg ions are thought to substitute in the YBa2Cu3O7−δ lattice, creating defects that produce a peak effect in the magnetic hysteresis loop. Mg additions alone lead to a reduced Tc, while Ce additions restore the Tc and enhance the magnitude of the peak.