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- W2129229802 abstract "In this study, boron powders with varying purity and form were mixed in different proportion to serve as precursors for reaction with Mg forming polycrystalline MgB2 bulks. The inductively measured superconducting transition temperature, T c and the critical current density, J c were compared to that of samples prepared from the respective single boron. Overall, T c remains largely unchanged for all samples. It was found that J c at 6 K and 20 K did not degrade significantly up to 4.6 T as a result of adding impure boron as much as 10 wt.% indicating comparable J c can be obtained without dependence of use of expensive high purity boron powder alone. The systematic decrease of J c with increasing impure boron additions shows that a compromise between desired J c and cost reduction can be made by varying the boron powder proportion. Finally, samples prepared from the mixture of both impure crystalline and amorphous borons even show enhanced J c up to 3 T at 20 K. The increase in J c correlates with the retention of strain level in these samples probably resulted from the more similar reaction rate of the respective borons." @default.
- W2129229802 created "2016-06-24" @default.
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- W2129229802 date "2009-06-01" @default.
- W2129229802 modified "2023-09-25" @default.
- W2129229802 title "The Critical Current Density of Polycrystalline ${rm MgB}_{2}$ Prepared by Using Boron Mixture" @default.
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- W2129229802 doi "https://doi.org/10.1109/tasc.2009.2018461" @default.
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