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The standard Gibbs energy change of the following reaction of cuspidine (3CaO.2SiO 2 .CaF 2 ) with water vapor has been determined by a transpiration method as 3CaO.2SiO 2 .CaF 2 (s)+H 2 O(g)=2(2CaO.SiO 2 )(s)+2HF(g) Δ r G°/kJ=265-0.116T (′16) (1 221<T/K<1 469) From this result, the standard Gibbs energy of formation of cuspidine has been evaluated as, Δ f G°(cuspidine)/kJ mol - 1 = -5 178+0.813T(′19) (1 221<T/K<1 469) The constituent activities of the CaO-SiO 2 -CaF 2 system and fluorine emission from the system at elevated temperatures have been evaluated based on the obtained thermodynamic data.

Determination of Gibbs Energy of Formation of Cuspidine (3CaO 2SiO2 CaF2) by Transpiration Method