ANALYSIS OF FUSION AND CRYSTALLIZATION PROCESSES OF CRYSTALLINE HYDRATES ON BASIS OF FUSIBILITY THERMOGRAMS

V.D. Aleksandrov, Sh.K. Amerkhanova, V.A. Postnikov, A.Yu. Sobolev, O.V. Sobol

DOI: 10.26456/pcascnn/2015.7.005

Original article

Abstract: On basis of heating and cooling thermograms analysis of fusion, dehydration, hydration and solidification processes of crystalline hydrates Na₂S₂O₃ ⋅5H₂O , Na₂SO₄ ⋅10H₂O , Na₂SO₃ ⋅7H₂O , Na₂CO₃ ⋅10H₂O and Na₂CH₃COO ⋅3H₂O is given. Hydrates structurization schemes in the liquid state are offered. The interpretation of different crystallization types reasons (quasiequilibrium and nonequilibrium-explosive) is given. Various stages of crystallization at EC and NEEC are considered. The equations for enthalpies of nucleation, coagulation and an isothermalpre-crystallization are obtained.

Keywords: crystalline hydrates, solutions, crystallization of water, fusion, dehydration, hydration, overcooling, equilibrium and nonequilibrium crystallization, nucleation, coagulation, enthalpy

• V.D. Aleksandrov
• Sh.K. Amerkhanova
• V.A. Postnikov
• A.Yu. Sobolev
• O.V. Sobol

Reference:

Aleksandrov V.D., Amerkhanova Sh.K., Postnikov V.A., Sobolev A.Yu., Sobol O.V. Analiz protsessov plavleniya i kristallizatsii kristallogidratov po termogrammam plavkosti [ANALYSIS OF FUSION AND CRYSTALLIZATION PROCESSES OF CRYSTALLINE HYDRATES ON BASIS OF FUSIBILITY THERMOGRAMS], Fiziko-khimicheskie aspekty izucheniya klasterov, nanostruktur i nanomaterialov [Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials], 2015, issue 7, pp. 5-15. DOI: 10.26456/pcascnn/2015.7.005. ⎘

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