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Current literature lacks simple ways to predict whether a given halide perovskite solid solution forms a single-phase system. Examining existing data suggests that single-phase A-site solid solutions are preferably formed when substituent cations are larger and have more N–H bonds than the host cation.

Graphical abstract: Does it mix? Insights and attempts to predict the formability of single phase mixed A-cation lead iodide perovskites

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