The acceleration of low-temperature sintering of MgB2 bulks with high critical density by minor Sn doping
The acceleration of low-temperature sintering of MgB2 bulks with high critical density by minor Sn doping
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DOI：
10.1088/0953-2048/23/2/025005
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发表时间：
2010-02
影响因子：
3.6
通讯作者：
Zongqing Ma;Hai Jiang;Yong-chang Liu
中科院分区：
文献类型：
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作者：
Zongqing Ma;Hai Jiang;Yong-chang Liu
在本研究中，通过Sn活化烧结在600 °C下仅5 h成功地合成了MgB 2块体，与在相同温度下烧结未掺杂样品所需的烧结时间相比，烧结时间显着减少。热分析表明，在烧结过程中首先形成局部Mg-Sn液相，并促进了Mg向B的扩散。结果表明，Mg与B之间的固-固反应加速，MgB 2相在低温下完全形成。MgB 2相的完全形成导致Sn掺杂样品在低温下烧结的高Jc。除此之外，烧结样品中的小MgB 2晶粒和纳米杂质也有助于Jc方面的良好性能。
In the present study, MgB2 bulk was successfully synthesized by Sn-activated sintering at 600 °C for just 5 h, exhibiting a dramatic decrease in the sintering time compared to that required for sintering an undoped sample at the same temperature. According to the thermal analysis, a local Mg–Sn liquid formed first during the sintering process and then this prompted the diffusion of Mg into B. As a result, the solid–solid reaction between Mg and B was accelerated and the phase formation of MgB2 was completely achieved at low temperature. The complete formation of the MgB2 phase results in a high Jc of the Sn-doped samples sintered at low temperature. Besides this, the small MgB2 grains and nanoimpurities in the sintered samples also contributed to the good performance as regards Jc.