甲苯和甲苯中的苹果酸对MgB2的碳掺杂
Carbon Doping of MgB2 by Toluene and Malic-Acid-in-Toluene
摘要：
采用差示扫描量热法（DSC）和热重分析法（TGA）研究了Mg和B存在下苹果酸的分解反应，结果表明苹果酸只与Mg反应，而不与B反应。此外，加入甲苯以溶解苹果酸，随后干燥，结果没有与Mg反应，表明苹果酸在溶解/干燥阶段已经分解。使用LECO CS600碳分析仪测量甲苯相对于甲苯/5重量%苹果酸混合物贡献的总碳。甲苯样品含有约0.4重量%的C，而甲苯/苹果酸混合物具有约1.5重量%的C，表明甲苯为最终产物贡献了大量的碳。电阻率测量的粉末管MgB 2 monopentary线建立，甲苯/苹果酸掺杂的样品具有最高的Bc 2。然而，仅甲苯样品在大部分磁场范围（0-9 T）内具有最高的传输Jc，仅在9 T以上的磁场中与甲苯/苹果酸样品相等。
英文摘要：
The decomposition of malic acid in the presence of Mg and B was studied using Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA) which revealed that malic acid reacted with Mg but not B. Also, the addition of toluene to dissolve malic acid followed by subsequent drying resulted in no reaction with Mg, indicating that the malic acid had decomposed during the dissolution/drying stage. The total carbon contributed by toluene versus a toluene/5 wt% malic acid mixture was measured using a LECO CS600 carbon analyzer. The toluene sample contained ~0.4 wt% C while the toluene/malic acid mixture had ~1.5 wt% C, demonstrating that the toluene contributed a significant amount of carbon to the final product. Resistivity measurements on powder-in-tube MgB2 monofilamentary wires established that the toluene/malic acid doped sample had the highest Bc2. However, the toluene-only sample had the highest transport Jc over most of the magnetic field range (0-9 T), equaled only by that of toluene/malic acid sample in fields above 9 T.
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