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Phase Equilibria in the System LiF-KF-B2O3-TiO2

M. Chrenková and V. Daněk

Institute of Inorganic Chemistry, Slovak Academy of Sciences, CS-842 36 Bratislava


Abstract: In the region of the primary crystallization of LiF in the ternary system LiF-KF-B2O3 a liquid miscibility gap is formed at the composition from 5 to 23 mole % B2O3 in the LiF-B2O3 boundary and up to 12 mole % KF in the ternary system. From the thermodynamic analysis of the binary systems it follows that the dissolution of boron oxide in molten lithium fluoride leads to the formation of Li2B4O7, while in molten potassium fluoride the compounds KBF4 and K2B4O7 are formed. These compounds are most probably present also in the melts of the ternary system. By addition of TiO2 into molten LiF or into molten LiF-KF mixtures insoluble Li2TiO3precipitates immediately from the melt. It may be therefore concluded that the rising of the temperature of primary crystallization in the melts of the system LiF-KF-B2O3-TiO2 is due to the formation of Li2TiO3 with a relatively high melting point.

Full paper in Portable Document Format: 464a222.pdf


Chemical Papers 46 (4) 222–225 (1992)

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