Thermodynamics of the vaporisation of thorium tetrachloride

Vapour pressures of solid and liquid ThCl4 have been measured in the temperature range 880 to 1037 K and 1045 to 1160 K both by transpiration and evaporation-temperature techniques. The vapour pressures obtained from the two methods agree well and so were combined to get the vapour-pressure equations for solid and liquid ThCl4. Melting temperature, evaporation temperature, and enthalpy of fusion at 1043 K for ThCl4 were evaluated. The values of the enthalpy of vaporization calculated from the vapour pressures for solid ThCl4 by second-law and third-law methods are presented. (author)