La2-xRExCuO4 (RE = Nd-Y) solid solution systems have been investigated to determine the factors stabilizing the T (La2CuO4), T’ (Nd2CuO4) and hybrid T*-type structures. A simple ionic model with a perovskite-like tolerance factor is found to accurately define the existence field of each. Metastable T* phases are observed for the larger RE cations Nd, Gd, Eu. The structure is quite stable for RE = Dy, Tb, but does not occur at all for the smallest rare earths. Oxygen activity plays a role in T’ and T* phase formation.
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Bringley, J.F., Trail, S.S., McElfresh, M. et al. Crystal Chemistry and Sub-Solidus Phase Relations in (La,Re)2CuO4 Systems. MRS Online Proceedings Library 169, 53–56 (1989). https://doi.org/10.1557/PROC-169-53