Effects of Sintering Temperature on Superconductivity in undoped and SiC-doped MgB2/Ti Wires
Abstract
The effects of sintering temperature on the superconducting properties of both undoped and SiC-doped MgB2 wires have been studied. The wires were fabricated by in situ powder-in-tube (PIT) method and characterized by x-ray diffraction, magnetization, scanning electron microscopy, and electrical resistivity measurements. Two groups of wire samples were prepared: the first group contains a pure MgB2 core and the second contains MgB2 core doped with 10 wt.% of 20 nm SiC. Both groups of samples were sintered for 30 minutes at the following temperatures: 650 C, 700 C, 750 C, 800 C, 850 C. It was found that the cores of these wires are almost in pure MgB2 superconducting phase and the superconducting transition temperatures of the wires are about 36 K. For both groups of samples, the critical current density (Jc ), measured at 5 K and 20 K in fields up to 7 Tesla, peaks up at sintering temperature 800 C. This result is in sharp contrast with recent results observed for Fe-sheathed wires for which the maximum Jc was achieved at lower sintering temperatures. Detail discussion will be given to explain such dependence of Jc on the sintering temperature.
- Publication:
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APS Texas Sections Fall Meeting Abstracts
- Pub Date:
- October 2007
- Bibcode:
- 2007APS..TSF.B6003H