Physics – Condensed Matter – Superconductivity
Scientific paper
2002-06-26
J. Supercond. 15 (2002) 599-601.
Physics
Condensed Matter
Superconductivity
3 pages including 6 figures. Presented at SCRM2002 conference. Submitted to the J. Supercond.: Inc. Novel Magnetism
Scientific paper
We report on the results of a comparative investigation of highly dense bulk MgB$_2$ samples prepared by three methods: (i) hot deformation; (ii) high pressure sintering; and (iii) mechanical alloying of Mg and B powders with subsequent hot compaction. All types of samples were studied by ac-susceptibility, dc-magnetization and resistivity measurements in magnetic fields up to $\mu_0H=160$ kOe. A small but distinct anisotropy of the upper critical field $H_{c2}^{a,b}/H_{c2}^{c}\sim1.2$ connected with some texture of MgB$_2$ grains was found for the hot deformed samples. The samples prepared by high pressure sintering as well as by mechanical alloying show improved superconducting properties, including high upper critical fields $H_{c2}$ ($\mu_0H_{c2}(0)\sim23$ T), irreversibility fields $H_{irr}$ which are strongly shifted towards higher values $H_{irr}(T)\sim0.8H_{c2}(T)$ and high critical current $J_c$ ($J_c=10^5$ A/cm$^2$ at 20 K and 1 T).
Bogacheva L. N.
Eckert Jürgen
Fuchs Guenter
Gümbel A.
Gutfleisch Oliver
No associations
LandOfFree
Comparative Study of Dense Bulk MgB$_2$ Materials Prepared by Different Methods does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Comparative Study of Dense Bulk MgB$_2$ Materials Prepared by Different Methods, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comparative Study of Dense Bulk MgB$_2$ Materials Prepared by Different Methods will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-195059