Tl-based superconductors of initial composition Tl:Ca:Ba:Cu equal to 2:2:2:3 and 1:3:1:3 were heated in oxygen at pressures of 104 to 6 x 105 Pa. The 2:2:2:3 composition formed primarily the 2-layer superconductor with zero resistance from 77 to 104 K. The 1:3:1:3 composition formed nearly phase pure 3-layer superconductor with a maximum zero resistance temperature of 120 K. Application of hyperbaric pressure influenced phase purities and transition temperatures slightly; phase purities decreased significantly with application of hypobaric pressures.
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Goretta, K.C., Routbort, J.L., Shi, D. et al. Hyper- and Hypobaric Processing of T1-Ca-Ba-Cu-O Superconductors. MRS Online Proceedings Library 169, 365–368 (1989). https://doi.org/10.1557/PROC-169-365