Improved irreversibility behavior and critical current density in MgB[sub 2]-diamond nanocomposites

Zhao, Y.; Cheng, C.H.; Rui, X.F.; Zhang, H.; Munroe, P.; Zeng, H.M.; Koshizuka, N.; Murakami, N.
October 2003
Applied Physics Letters;10/6/2003, Vol. 83 Issue 14, p2916
Academic Journal
MgB[sub 2]-diamond nanocomposite superconductors have been synthesized by addition of nanodiamond powder. Microstructural analysis shows that the nanocomposite superconductor consists of tightly packed MgB[sub 2] nanograins (∼50–100 nm) with highly dispersed and uniformly distributed diamond nanoparticles (∼10–20 nm) inside the grains. The J[sub c]–H and H[sub iir]–T characteristics have been significantly improved in this MgB[sub 2]-diamond nanocomposite, compared to MgB[sub 2] bulk materials prepared by other techniques. Also, the J[sub c] value of 1×10[sup 4] A/cm[sup 2] at 20 K and 4 T and the H[sub irr] value of 6.4 T at 20 K have been achieved. © 2003 American Institute of Physics.


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