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Determination of the Enthalpy and Entropy of Peritectic Reaction in the CaO Si02(CS)—2CaO Si02(C2S)—2CaO Al203 Si02(C2AS) System at the Equilibrium Temperature 1588 К

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

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

 

Abstract: Inverse drop calorimetry performed in a SETARAM HTC 1800 K was used to measure the relative enthalpy value of the ternary peritectic melt (p.m.) in the CS-C2S-C2AS system at the temperature 1754 K with regard to the reference state of a mechanical mixture of β-C2S, CS, and C2AS crystals of corresponding composition at 298 K. The same method was applied to measure the relative enthalpy values of peritectic melt in the temperature interval 1624 K-1775 K with regard to the reference state of its glass at 298 K. From these data the temperature-independent value of specific heat capacity of the peritectic melt was determined: cp(p.m.) = (1.8213 +/- 0.1318) J g-1 K-1. Using these quantities and the literature data of some enthalpic quantities for crystalline phases of compounds in the CS-C2S-C2AS system, the specific enthalpy of peritectic reaction (p.r.) in this system at equilibrium temperature 1588 K was determined: ∆p.r.h(1588K) = (231 +/- 33) J g-1. For determination of this quantity the material balance of peritectic reaction and the material balance of dissociation of C3S2 to β-C2S and CS were also used.

Full paper in Portable Document Format: 526a725.pdf

 

Chemical Papers 52 (6) 725–730 (1998)

Tuesday, June 18, 2024

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