Thermodynamic data for solid AgI and its phase transitions from ENF measurements

From EMF measurements in the cell Ag(s)/AgI(s)/I₂(g), graphite as a function of temperature, the enthalpy and entropy values for the formation of γ-, β- and α-AgI were obtained. From these data, the following thermodynamic quantities corresponding to the phase transitions were also calculated: Δ_tH_γ→β= -34.3 ±2 kJmol^-1, Δ_tS_γ→β= -107 ± 4 Jmol^-1K^-1, Δ_tH_β→α = 5.4 ± 2 kJmol^-1, Δ_tS_β→α = 23 ± 4 Jmol^-1K^-1.