Ceramics-Silikáty 30, (1) 1 - 8 (1986) |
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DETERMINATION OF STANDARD ENTHALPIES AND GIBBS' ENERGIES OF FORMATION FOR 6 CaO.Al2O3.3SO3.32H2O (C6AS3H32) AND 4 CaO.Al2O3.SO3.12H2O (C4ASH12) BY THE DHA METHOD
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Šatava Vladimír
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Department of Silicates, Institute of Chemical Technology, Suchbatarova 5, 166 28 Prague 6
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The DHA method was used to determine the equilibrium temperatures and the reaction
enthalpy values for the following reactions:
C6AS3H32(s) = C4ASH12(s) + 2 CSH0.5(s) + 10 H(l)
and
C4ASH12(s) = C3AH6(s) + CS(s) + 6 H(l).
The data obtained were used for calculating the following values of C6AS3H32,
ΔH̊f (298 K) = -17 492.5 kJ mole-1, S̊ (298 K) = 1 891. 6 J mole-1 K-1
and
ΔG̊f (298 K) = -15 156.2 kJ mole-1,
and the following values for C4ASH12:
ΔH̊f (298 K) = -8 716.9 kJ mole-1, S̊ (298 K) = 791.0 J mole-1 K-1
and
ΔG̊f (298 K) = -7 732.1 kJ mole-1. |
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