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

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)