The effect of MgO addition on the formation and the superconducting properties of the Bi2223 phase
The effect of MgO addition on the formation and the superconducting properties of the Bi2223 phase
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DOI：
10.1016/s0921-4534(02)02360-2
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发表时间：
2003-05-15
影响因子：
1.7
通讯作者：
Noudem, JG
中科院分区：
文献类型：
--
作者：
Guilmeau, E;Andrzejewski, B;Noudem, JG
以不同的质量分数将MgO颗粒引入到（Bi，Pb）（2）Sr_2Ca_2Cu_3O_（10）+ δ粉末中。由Bi 2223/MgO粉末制成块状样品，并在不同温度下热处理。研究了不同MgO含量和不同烧结条件下的相形成和显微结构。结果发现，在845 ℃以下，当MgO的量增加时，Bi 2223相的比率降低。MgO的添加导致Bi 2201相含量通过液体粘度的增加而降低。MgO的存在影响了样品的微观结构，并降低了Bi 2223晶粒的平均尺寸。通过磁滞测量研究了MgO添加对晶间临界电流密度J（c）随磁场变化的影响。MgO的存在显着扩大了磁化磁滞回线，从而增加了MgO含量（不超过15wt%）的J（c）。(C)2002 Elsevier Science B. V.保留所有权利。
MgO particles were introduced into (Bi,Pb)(2)Sr2Ca2Cu3O10+delta powder in various weight fractions. Bulk samples were made from the Bi2223/MgO powder and heat-treated at various temperatures. The phase formation and the microstructure were studied for different amounts of MgO and for different sintering conditions. It was found that, below 845 degreesC, the ratio of Bi2223 phase decreased when the amount of MgO increased. The addition of MgO caused the Bi2201 phase content to decrease via an increase of the liquid viscosity. The presence of MgO influenced the microstructure of the samples and decreased the mean size of Bi2223 grains. The effects of the MgO addition on the intergranular critical current density, J(c) as a function of magnetic field was investigated by magnetisation hysteresis measurements. MgO presence significantly expands the magnetisation hysteresis loop and thus increases J(c) for amount of MgO, which does not exceed 15 wt.%. (C) 2002 Elsevier Science B.V. All rights reserved.