Processing and physical properties of single phase Tl2Ba2CaCu2O8 and (Tl0.5Pb0.5)Sr2-xBaxCa 2Cu3O9 superconductors
Single phase Tl2Ba2CaCu2O8 (2212) superconductors with Tc of 97 K were obtained by a two-step synthesis. Prolonged annealing at 860°C in the second step of the synthesis resulted in a higher Tc, at the expense of the growth of an impurity trilayer 2223 phase in the form of stacking faults in the 2212 phase. Nearly single phase (Tl0.5Pb0.5)Sr2-xBaxCa 2Cu3O9) (1223) samples were obtained in a single air-sintering step. Replacement of Sr by Ba is necessary to grow the 1223 phase. Samples with x = 0.75 displayed Tc as high as 117 K with a superconducting volume fraction over 50%. © 1997 Elsevier Science Ltd. All rights reserved.
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Subramanyam, G.; Ju, Z.; Fahmy, M.; Shand, P. M.; Zhang, M.; and Boolchand, P., "Processing and physical properties of single phase Tl2Ba2CaCu2O8 and (Tl0.5Pb0.5)Sr2-xBaxCa 2Cu3O9 superconductors" (1998). Faculty Publications. 3879.