Abstract
In order to explain the role of gases in the stabilization of the structure of 12CaO.7Al 2O 3 a mass-spectrometric study was carried out in vacuum of 10 −9 atm and in the temperature range of 900° – 1346°C, using polycrystalline samples obtained from the crystallization of melts soaked at 1500°C. It has been demonstrated by thermodynamic analysis of partial pressures of H 2O, CO 2, CO and O 2 measured over the samples that the gases CO 2, CO and O 2 were sorbed by the specimens in molten state and were encapsulated during its crystallization, while the water vapours further penetrated into the zeolitic structure of the crystals at the time of their cooling. High values of isosteric heat of desorption of gases CO 2, CO, and O 2, such as 70–80 K-cal/mole, show that the desorption of these gases takes place due to the breakdown of the crystal lattice, while the removal of water with isosteric heat of desorption of about 11 K-cal/mole occurs as a result of its escape through the ‘windows’ in the cellular structure of the crystal. Based on these experimental results a structural model of the melt formed from 12CaO.7Al 2O 3 crystals has been developed.
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