Abstract
The relationships between microstructures, crystallinity and critical current properties forB4C doped MgB2 bulks, MgB2−5x(B4C)x with x = 0, 0.04, 0.1, 0.2 and 0.4, were systematically studied. Decreases ofTc andthe a-axis length and deterioration of the crystallinity ofMgB2 due to the carbon substitution occurred uponB4C doping. Substantiallyimproved Jc wasobserved in the B4C doped MgB2 bulks especially at 5 K under high magnetic fields. Strengthened flux pinning at grainboundaries by carbon substitution was considered to contribute to the improvement ofJc. Furthermore,the reactivity of B4C with magnesium and boron was found to be much higher than that of graphite. These findings suggested thatB4C is a promising carbonsource dopant for MgB2 materials with excellent Jc properties, particularly under magnetic fields.
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