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• W4308148274 abstract "Various metallic particles A were added to the filling powder in ex situ processed MgB2 tapes. The superconducting properties such as critical temperature (Tc) and transport critical current density (Jc) of those sintered tapes depend on the additives. Some additives such as Te can enhance the Jc property, whereas the others such as Mo, Nb and W can cause a Jc deterioration. The Jc enhancement is due to the improved grain connectivity and the enhancement in both upper critical field (Hc2) and irreversibility field (Hirr), whereas the origin of the Jc deterioration is the Tc reduction which is probably brought about by the reaction of the additives with MgB2. The detrimental additives possibly substitute the Mg site, Mg1−yAyB2. In contrast, the other additives which do not cause significant Jc deterioration neither form borides, ApBq, nor cause substitution reaction influencing the superconducting properties. Thus, neither reduction of superconducting phase MgB2 in the core layer nor Tc reduction occurs. Te addition reduces the optimal sintering temperature (Tsin) at which best performance in transport Jc at 4.2 K and 10 T is obtained by only 30 °C, from 710 °C to 680 °C. This Tsin reduction is much smaller than that for Sn addition, about 100 °C. Nevertheless, when sintered at temperatures of 530–560 °C, the Jc values of the tapes with Te addition are around 150 A/mm2, which is comparable to those with Sn addition and twice as large as those of the tapes without addition. Thus, Te is effective for improving the Jc property over a wide range of Tsin among various additives." @default.
• W4308148274 created "2022-11-08" @default.
• W4308148274 creator A5051346975 @default.
• W4308148274 date "2022-12-01" @default.
• W4308148274 modified "2023-09-29" @default.
• W4308148274 title "Effect of metallic particle addition to the filling powders on the superconducting properties of ex situ processed MgB2 tapes using milled powders" @default.
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• W4308148274 doi "https://doi.org/10.1016/j.physc.2022.1354172" @default.
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