However, experimental determination of phase diagrams is usually expensive. Phase diagrams of molten salt hydrates have found meaningful applications in the development of new heat storage materials. Based on the BET calculations, a list of new eutectic temperatures and compositions of salt hydrate mixtures is given. Good agreement with the experimental data was found, when the presumptions of the BET model in respect to water activity and chemical interactions are satisfied. Applying the multi-component formulation of the BET model according to Ally and Braunstein, phase diagrams of aqueous ternary systems composed of the salts LiNO 3, NaNO 3, Mg(NO 3) 2, Ca(NO 3) 2, Zn(NO 3) 2, LiCl, CaCl 2, LiClO 4, and Ca(ClO 4) 2 were predicted and compared with available experimental data. The parameters were used to model the solid–liquid phase diagrams and to extract the temperature functions of the Gibbs energy of formation of all occurring solid phases with respect to pure liquid water and anhydrous molten salts as reference states. From water activity data within the concentration range of molten salt hydrates the parameters r i and ε i of the modified Brunauer, Emmett and Teller (BET) equation have been determined for several salts i.
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