ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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 ∆H_fus(C₂AS,cryst; 1863 K) = (172.1 ± 6.0)kJmoľ^-1 ∆H_fus(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)