Phase formation and superconductivity of fe-tube encapsulated and vacuum-annealed MgB2

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dc.contributor.authorSingh, K. P.
dc.contributor.authorAwana, V. P. S.
dc.contributor.authorShahabuddin, M. D.
dc.contributor.authorHusain, M.
dc.contributor.authorSaxena, R. B.
dc.contributor.authorNigam, Rashmi
dc.contributor.authorAnsari, M. A.
dc.contributor.authorGupta, Anurag
dc.contributor.authorNarayan, Himanshu
dc.contributor.authorHalder, S. K.
dc.contributor.authorKishan, H.
dc.date.accessioned2016-12-07T12:30:46Z
dc.date.available2016-12-07T12:30:46Z
dc.date.issued2006
dc.description.abstractWe report optimization of the synthesis parameters viz. heating temperature (TH), and hold time (thold) for vacuum-annealed (10􀀀5 Torr) and LN2 (liquid nitrogen) quenched MgB2 compound. These are single-phase compounds crystallizing in the hexagonal struc- ture (space group P6=mmm) at room temperature. Our XRD results indicated that for phase-pure MgB2, the TH for 10􀀀5 Torr annealed and LN2-quenched samples is 750 C. The right stoichiometry i.e., MgB2 of the compound corresponding to 10􀀀5 Torr and TH of 750 C is found for the hold time (thold) of 2.30 hours. With varying thold from 1{4 hours at xed TH (750 C) and vacuum (10􀀀5 Torr), the c-lattice parameter decreases rst and later increases with thold (hours) before a near saturation, while the a-lattice parameter rst increases and later decreases beyond a thold of 2.30 hours. The c=a ratio versus thold plot showed an inverted bell-shaped curve, touching the lowest value of 1.141, which is the reported value for perfect stoichiometry of MgB2. The optimized stoichi- metric MgB2 compound exhibited superconductivity at 39.2 K with a transition width of 0.6 K. In conclusion, the synthesis parameters for phase pure stoichimetric vacuum- annealed MgB2 compound are optimized and are compared with widely-reported Ta tube encapsulated samples.en_ZA
dc.identifier.issn0217-9849 (print)
dc.identifier.issn1793-6640 (online)
dc.identifier.urihttp://repository.tml.nul.ls/handle/20.500.14155/963
dc.language.isoenen_ZA
dc.publisherWorld Scienti fic Publishing Companyen_ZA
dc.rightsCopyright World Scienti fic Publishing Companyen_ZA
dc.sourceModern Physics Letters B, Vol. 20, No. 27 (2006) 1763{1769en_ZA
dc.subjectMgB2en_ZA
dc.subjectFe-encapsulationsen_ZA
dc.subjectsuperconductivityen_ZA
dc.subjectvacuum synthesisen_ZA
dc.titlePhase formation and superconductivity of fe-tube encapsulated and vacuum-annealed MgB2en_ZA
dc.typeArticleen_ZA
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