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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)
Appears in Collections:IJPAP Vol.44(06) [June 2006]

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