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• W2327301650 abstract "Abstract MgB 2 bulk superconductors are synthesized by the solid state reaction of (MgB 4 +xMg) precursors withexcessive Mg compositions (x=1.0, 1.4, 2.0 and 2.4). The MgB 4 precursors are synthesized using (Mg+B) powders. Thesecondary phases (MgB 4 and MgO) present in the synthesized MgB 4 are removed by HNO 3 leaching. It is found thatthe formation reaction of MgB 2 is accelerated when Mg excessive compositions are used. The magnetization curves ofMg 1+x B 2 samples show that the transition from the normal state to the superconducting state of the Mg excessive sam-ples with x=0.5 and x=0.7 are sharper than that of MgB 2 . The highest J c -B curve at 5 K and 20 K is achieved forx=0.5. Further addition of Mg decreases the J c owing to the formation of more pores in the MgB 2 matrix and smallervolume fraction of MgB 2 . Keywords: MgB 2 , MgB 4 , Mg excessive, Critical temperature, Critical current density ······························································································································· ·································································································" @default.
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• W2327301650 date "2015-10-30" @default.
• W2327301650 modified "2023-10-18" @default.
• W2327301650 title "Superconducting Properties and Phase Formation of MgB2 Superconductors Prepared by the Solid State Reaction Method using MgB4 and Mg Powder" @default.
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• W2327301650 doi "https://doi.org/10.4150/kpmi.2015.22.5.344" @default.
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