Premium
Phase Equilibria in the Alkali Fluoride‐Uranium Tetrafluoride Fused Salt Systems: III, The System NaF–LiF–UF 4
Author(s) -
THOMA R. E.,
INSLEY HERBERT,
LANDAU B. S.,
FRIEDMAN H. A.,
GRIMES W. R.
Publication year - 1959
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1959.tb09137.x
Subject(s) - liquidus , chemistry , eutectic system , ternary numeral system , alkali metal , phase diagram , ternary operation , fluoride , solubility , analytical chemistry (journal) , phase (matter) , halide , mole fraction , inorganic chemistry , crystallography , chromatography , microstructure , organic chemistry , computer science , programming language
The phase equilibrium diagram of the ternary system NaF–LiF–UF 4 described in this paper is based on evidence from thermal analysis and from microscopic and X‐ray analyses of samples obtained from thermal gradient quenching experiments. Temperature‐composition relations were established through the temperature interval between the liquidus and a lower limit of about 300°C. All the stable compounds in the binary systems LiF–UF 4 and NaF‐UF 4 , (including the subsolidus compound NaF·2UF 4 ) display primary phase fields in the ternary system. No ternary compounds of NaF–LiF–UF 4 occur. The following eutectics are to be found in the ternary system: 60 NaF, 21 LiF, 19 mole % UF 4 , 480°C.; 35 NaF, 37 LiF, 28 mole % UF 4 , 480°C.; 24.3 NaF, 43.5 LiF, 32.2 mole % UF 4 , 445°C.; and 24.5 NaF, 29 LiF, 46.5 mole % UF 4 , 602°C. The compounds 7NaF · 6UF 4 and 7LiF · 6UF 4 display limited solubility in each other. The exact limits of the miscibility gap in the 7NaF · 6UF 4 ‐7LiF · 6UF 4 join have not been determined.