Effect of temperature and concentration of solution in chemical treatment for MgB2 powder on the Jc–B property of ex situ processed MgB2 superconducting tapes

Effect of temperature and concentration of solution in chemical treatment for MgB2 powder on the Jc–B property of ex situ processed MgB2 superconducting tapes
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MgB2粉末化学处理温度和溶液浓度对异位处理MgB2超导带材Jc-B性能的影响

DOI:
10.1016/j.physc.2010.01.065
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发表时间:
2010
影响因子:
1.7
通讯作者:
K. Ozawa
K. Ozawa
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
H. Fujii;K. Ozawa

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采用粉末-管(PIT)技术,在高温下将粉末置于不同浓度的苯甲酸溶液中,通过非原位工艺制备了MgB{sub 2}带。在溶液的沸点(BPs)下处理的热处理带材中MgB{sub 2}中的碳取代量小于在室温(RT)下的碳取代量。这种碳取代改善了高场区域中的J{sub c}特性。对于RT处理,随着溶液浓度的增加,J{sub c}性质得到改善。相反,随着BP处理浓度的增加,J{sub c}性质恶化。另一方面,用纯溶剂处理在RT和BP下都不带来J{sub c}增强和碳取代。这表明,对于溶解附着在MgB{sub 2}表面的MgO层所必需的酸性是碳置换所必需的。BP处理增强了酸的作用,并可能对MgB{sub 2}本身造成损害。
MgB{sub 2} tapes were fabricated through an ex situ process in a powder-in-tube (PIT) technique using powders treated at elevated temperatures in benzene solutions of benzoic acid with various concentrations. The amount of carbon substitution in MgB{sub 2} in heat-treated tapes with treatment at the boiling points (BPs) of the solutions is smaller than that at room temperature (RT). This carbon substitution improves the J{sub c} property in the high-field region. For RT treatment, the J{sub c} property is improved with increasing the solution concentration. In contrast, the J{sub c} property is deteriorated with increasing the concentration for BP treatment. On the other hand, treatment with pure solvent does not bring about the J{sub c} enhancement and carbon substitution at all at both RT and the BPs. This suggests that acidity essential for the dissolution of MgO layers attached to the surface of MgB{sub 2} is required for carbon substitution. The BP treatment enhances the acting of the acidity and possibly inflicts damage on MgB{sub 2} itself.
“使用经过各种化学溶液处理的粉末通过异位工艺制造的 MgB_2 带材的临界电流密度得到提高”
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