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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.44 [2006] >
IJPAP Vol.44(06) [June 2006] >
| Title: | Synthesis of MgB2 from magnesium rich powders |
| Authors: | Rajput, Suchitra
Chaudhary, Sujeet
Kashyap, Subhash C |
| Keywords: | MgB2
Transition Temperature
Susceptibility
Superconductivity |
| Issue Date: | Jun-2006 |
| Publisher: | CSIR |
| IPC Code: | H01L 39/00 |
| Abstract: | Superconducting
bulk MgB2 samples have been synthesized by employing a modified heat
treatment without using any additional process steps generally undertaken in
view of the substantial loss of Mg during sintering owing to its high vapour
pressure at the processing temperature. Starting with Mg rich powder mixtures
having different atomic ratios of Mg:B (as against the nominally required 1:2
ratio), we have obtained superconducting MgB2 samples showing a
transition temperature (Tc)
in the range 40.4-40.7K when synthesized at sintering temperatures in the range
720-900°C. Typically, a MgB2 sample
(Tc = 40.5K) obtained from
heat treating Mg and B in the ratio of 2:2 at 870°C for 1h duration exhibited critical current density in excess of 1×107 A/m2 at ≈38K. Our results further show that MgO is not detrimental to
superconductivity. |
| Page(s): | 461-467 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.44(06) [June 2006]
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