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Determination of the heat of fusion of 2CaO.Al2O3.SIO2 (gehlenite)

O. Žigo, K. Adamkovičová, L. Kosa, I. Nerád, and I. Proks

Institute of Inorganic Chemistry, Centre for Chemical Research, Slovak Academy of Sciences, CS-84236 Bratislava

 

Abstract: Gehlenite (C2AS) and the melt of composition corresponding to C2AS were prepared by a precursor method. The temperature dependences of the relative enthalpy of gehlenite and of the melt C2AS were determined in the temperature intervals 1519 K—1799 К and 1873 K—1948 K, respectively. Combination of measurements in the drop calorimeter and in the cal­orimeter for determination of the heat of solution was used. On the basis of these data the value of the heat of fusion and the entropy of fusion of gehlenite were determined at the equilibrium temperature 1863 K. It was found that ∆Hfus(C2AS,cryst; 1863 K) = (172.1 ± 6.0)kJmoľ-1 ∆Hfus(C2AS,cryst; 1863 K) = (92.4 ± 3.2) J mol-1 К-1

Full paper in Portable Document Format: 412a171.pdf

 

Chemical Papers 41 (2) 171–181 (1987)

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