We have examined several crystals belonging to the Tl-2122 structure type (Tl2CaBa2Cu2O8 with c=29Å), and have shown that cation solid solution occurs. Such cation disorder appears to be responsible for the observed small differences in lattice parameters reported by various investigators and to contribute towards the substantial variation in the superconducting transition temperatures.
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Morosin, B., Ginley, D.S., Venturini, E.L. et al. Cation Disordering in the Tl-2122 Superconductors. MRS Online Proceedings Library 169, 141–144 (1989). https://doi.org/10.1557/PROC-169-141