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(A) Linear fit of measured enthalpy of formation vs. tolerance factor of MAPbX3 end members (filled symbols). Calculated values for other possible compositions (open symbols) are plotted vs. their calculated tolerance factors. Plots of tolerance factor as a function of (B) X-site substitution of MAPbX3, MASnX3, FAPbX3, and FASnX3 and (C) A-site substitution of APbI3.
