Yakinci, MEBalci, YAksan, MAAdigüzel, HIGencer, A2024-08-042024-08-0420020896-1107https://doi.org/10.1023/A:1021215728989https://hdl.handle.net/11616/93615Superconducting 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 alpha-alumina container closed with a cup and fired under high purity argon gas. The other series of samples was placed in an a-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 x 10(5) x A/cm(2) at 10 K and 0 T, and for the second series of samples was 0.7 x 10(4) x A/cm(2) at 10 K and 0 T.eninfo:eu-repo/semantics/closedAccessMgB2MgB4 phaseArticle15660761110.1023/A:10212157289892-s2.0-0141456927N/AWOS:000179495900024Q3