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Enthalpie Analysis of Melts in the CaO Si02(CS)—2CaO Si02(C2S)—2CaO Al203 Si02(C2AS) System

L. Kosa, I. Nerád, K. Adamkovičová, and E. Mikšíková

Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava

 

Abstract: The heats of solution of  γ-C2S and β-C2S at temperature 298 K have been measured to reach the consistency of the values of relative enthalpy of melts in the CS-C2S-C2AS system determined by two different methods: combination of measurements with the drop and solution calorimeters and the method of inverse drop calorimetry. Assuming that the athermic solutions are formed on the connecting line CS-C2S, the temperature-composition dependence of relative enthalpy in the CS-C2S-C2AS system has been determined by regressive analysis. On the basis of this dependence the enthalpies of mixing on formation of melts in part of the CS-C2S-C2AS system, i.e. the C3S2-CS-C2AS subsystem, from the melts of CS, C2S, and C2AS at temperature 1873 K were calculated. The obtained values point to exothermic character of reactions on formation of the melts of this subsystem from the CS, C2S, and C2AS melts.

Full paper in Portable Document Format: 526a731.pdf

 

Chemical Papers 52 (6) 731–735 (1998)

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