Degradation of Superconducting Properties in MgB2 by Formation of the MgB4 Phase |
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Authors: | M E Yakıncı Y Balcı M A Aksan H İ Adigüzel A Gencer |
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Affiliation: | 1. Fen-Edb. Fakültesi, Fizik B?lümü, ?n?nü üniversitesi, 44069, Malatya, Turkey 2. Fen Fakültesi, Fizik B?lümü, Ankara üniversitesi, 06100, Ankara, Turkey
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Abstract: | Superconducting MgB2 polycrystalline samples have been fabricated under two different conditions in order to determine the effect of MgB4 phase. A series of samples was placed in an α-alumina container closed with a cup and fired under high purity argon gas. The other series of samples was placed in an α-alumina boot without any lid and fired under similar conditions. For the first series of samples, we have found pure MgB2 phase formation and a narrow transition width at 0.4 K. For the second series of samples, significant amount of MgB4 phase were formed and the T zero was decreased to 27 K. For both the group of samples magnetization hysteresis loops obtained at various temperature range and applied field up to 2 T. The best J cmag for the first series of samples was 1.9 × 105 A/cm2 at 10 K and 0 T, and for the second series of samples was 0.7 × 104 A/cm2 at 10 K and 0 T. |
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