Correlation of phase formation, critical transition temperature Tc, microstructure, and critical current density Jc with sintering temperature has been studied for acetone doped MgB2/Fe tapes. Sintering was performed at 600-850 °C for 1 h in a flowing Ar atmosphere. High boron substitution by carbon was obtained with increasing the sintering temperature; however, the acetone doped samples synthesized at 800 °C contain large size MgB2 grains and more MgO impurities. Incomplete reaction for the acetone doped samples heated at 600 °C result in bad intergrain connectivity. At 4.2 K, the best Jc value was achieved in the acetone doped sample sintered at 700 °C, which reached 24,000 A/cm2 at 10 T and 10,000 A/cm2 at 12 T, respectively. Our results indicate that the small grain size and less impurity were also important for the improvement of Jc-B properties besides the substitutions of B by C.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering