Solid State Science and Technology, Vol. 14, No 1 & 2 (2006) 81-87
EFFECT OF NANOSIZE MgO PARTICLES ADDITION ON FORMATION AND SUPERCONDUCTIVITY OF
Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor.
In this paper, nanosize MgO particles were added to Tl0.9Bi0.1Sr1.95Ta0.05Ca0.9Y0.1Cu2O7- δ superconductor in various weight fraction between 0 wt.% to 0.8 wt.% before sintering using the conventional solid state synthesis method. The phase formation and the microstructure of the samples were studied by XRD and SEM, respectively. The highest critical temperature Tc zero of 80 K was observed at 0.2 wt.% MgO and Tc was gradually suppressed for higher MgO additions. The effect of the MgO addition on Jc revealed maximum Jc at 0.2 wt.% MgO addition. SEM investigations revealed no difference in microstructure for the pure sample and the MgO added samples. The results showed that a small amount of MgO addition (0.2 wt.%) in Tl-1212 enhanced Jc and this is suggested as due to increased flux pinning in the sample due to the MgO addition.
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