Vaporisation thermodynamics of caesium iodide and caesium chromate

Vaporisation studies over solid and liquid CsI have been carried out by Knudsen effusion (753 – 897 K) transpiration (862 – 1125 K) and boiling temperature (977 – 1430 K) methods. The Knudsen mass loss and transpiration data over CsI(s) are consistent with the presence of monomeric species upto 873 K and the vapour pressure values can be represented by the equation: log₁₀P(kPa) = (7.59 ± 0.12) ? 0.00113 T(K) ? (10301 ± 95)/T(K) ? 21088/T²(K) + 1.13 log₁₀T(K) Transpiration and boiling temperature data were used to calculate partial pressures of monomeric (p₁°) and dimeric (p₂°) species over CsI(1) and the values obtained can be represented by the following equations: log₁₀P₁°(kPa) = (19.67 ± 0.38) ? (9628 ± 344)T(K) ? 3.65 log₁₀T(K)log₁₀P₂°(kPa) = (28.42 ± 0.41) ? (9986 ± 415)T(K) ? 6.56 log₁₀T(K) Vapour pressure of Cs₂CrO₄(1) was measured in the temperature range 1225 to 1405 K by transpiration method and vapour pressure calculated assuming monomeric species can be represented by the equation: log₁₀p(kPa) = (8.32 ± 0.26) ? (13434 ± 344)T(K)