Effect of Heat-Treatment on the Crystallization of B Powder and Critical Current Density Property of MgB2 Superconductor

被引：0
作者：
You, Byung Youn [1 ]
Kim, Chan-Joong [1 ]
Park, Soon-Dong [1 ]
Jun, Byung-Hyuk [1 ]
机构：
[1] Korea Atom Energy Res Inst, Neutron Utilizat Technol Div, 989-111 Daedeok Daero, Taejon 305353, South Korea
来源：
KOREAN JOURNAL OF MATERIALS RESEARCH | 2014年 / 24卷 / 09期
关键词：
MgB2; superconductor; B powder; heat-treatment; crystallization; critical current density;
D O I：
10.3740/MRSK.2014.24.9.465
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The crystallization effects of boron (B) powder on the phase, full width at half maximum (FWHM) values, and critical properties were investigated for in-situ reacted MgB2 bulk superconductors. The semi-crystalline B powder was heat-treated at different temperatures of 1000, 1300 and 1500 degrees C for 5 hours in an Ar atmosphere. Then, using as-received and heat-treated B powders, the MgB2 samples were prepared at 600 degrees C for 40 hours in an Ar atmosphere. As the heat-treatment temperature of the B powder increased, both the particle size of the B powder and crystalline phase increased. In the case of MgB2 samples using B powders heat-treated at above 1300 degrees C, unreacted magnesium (Mg) and B remained due to the improved crystallinity of the B powder. As the heat-treatment temperature of B powder increased, the critical current density of MgB2 decreased continuously due to the reduction of grain boundary density and superconducting volume caused by unreacted Mg and B.
引用
收藏
页码：465 / 468
页数：4
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