Abstract
Correlation of phase purities, microstructure,Jc and Hc2 with sintering temperature has been studied in Zn-stearate-dopedMgB2/Fe tapes. All doped tapes show significant enhancements inJc and Hc2. TEM analyses revealed that strong flux pinning centers induced by grain boundaries andcrystal defects as well as carbon substitution effect are responsible for the improvement ofJc and Hc2 values. Although a high sintering temperature of850 °C increases the grain size, improved grain connection can compensate for this disadvantage, giving thebest Jc of 2.0 × 104 A cm−2 at 4.2 K and 10 T. On the other hand, tapes sintered at900 °C have alower Jc due to the larger grain size and more MgO impurities.
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