Heat capacity and thermodynamic functions of di-,tri- and tetramethylammonium lead iodide perovskites from 289 to 473 K
The heat capacity of di-, tri- and tetramethylammonium lead iodide perovskites of general formula (CH3)xNH4–xPbI3 (where 2≤x≤4) has been determined by differential scanning calorimetry (DSC) in the temperature range 289–473 K using the step-scan mode. Standard molar values C0p(298 K) of di-, tri- and tetramethylammonium lead iodide perovskites were found to be: (285.2, 318.8 and 363.4) J K–1 mol–1, respectively. Heat capacity data have been used to evaluate the thermodynamic functions of the three (CH3)xNH4–xPbI3 perovskites (entropy and enthalpy increment).