Akademik Veri Yönetim Sistemi
Journal of Low Temperature Physics, cilt.181, sa.1-2, ss.38-48, 2015 (SCI-Expanded, Scopus)
We fabricated malic acid $$(\hbox {C}_{4}\hbox {H}_{6}\hbox {O}_{5})$$(C4H6O5)-added $$\hbox {MgB}_{2}$$MgB2 bulks by wet mixing and “Two-step solid state reaction method”. The effects of adding malic acid on $${ T}_{\mathrm{c}}$$Tc, $${ J}_{\mathrm{c}}-{ H}$$Jc-H behaviour and lateral levitation force $$({ F}_{\mathrm{x}})$$(Fx) features of bulk $$\hbox {MgB}_{2}$$MgB2 have been investigated. A systematic decrease in the critical temperature $${ T}_{\mathrm{c}}$$Tc with increasing adding level confirms the substitution of C at the B site of $$\hbox {MgB}_{2}$$MgB2. While the 4 wt% sample showed the best $${ J}_{\mathrm{c}}$$Jc of $$3.7\times 10^{4}$$3.7×104$$\hbox {A/cm}^{2}$$A/cm2 at 4 T and 5 K, 15 wt% sample showed uncompetitive lower critical current density $$({ J}_{\mathrm{c}})$$(Jc), which ascribes the poor connectivity due to the excessive unsubstituted C distribution at grain boundaries and the presence of high MgO amount. At 24 and 28 K, the 4 and 6 wt% malic-acid-added samples exhibit a higher lateral force than pure sample. Based on the observed values of M–H, $${ J}_{\mathrm{c}}$$Jc (H) and lateral levitation force $$({ F}_{\mathrm{x}})$$(Fx), it can be concluded that the 4 wt% malic-acid-added sample is the best of the studied samples.