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Enthalpy of formation of yeâelimite and ternesite
Calcium sulfoaluminate clinkers containing yeâelimite (Ca4Al6O12(SO4)) and ternesite (Ca5(SiO4)2SO4) are being widely investigated as components of calcium sulfoaluminate cement clinkers. These may become low energy replacements for Portland cement. Conditional thermodynamic data for yeâelimite and ternesite (enthalpy of formation) have been determined experimentally using a combination of techniques: isothermal conduction calorimetry, X-ray powder diffraction and thermogravimetric analysis. The enthalpies of formation of yeâelimite and ternesite at 25 °C were determined to be â 8523 and â 5993 kJ molâ1, respectively