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Phase Equilibria for the Ternary Fused‐Salt System NaF–BeF 2 –UF 4
Author(s) -
EICHELBERGER J. F.,
HUDGENS C. R.,
JONES L. V.,
PISH G.,
RHINEHAMMER T. B.,
TUCKER P. A.,
WITTENBERG L. J.
Publication year - 1963
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.1151-2916.1963.tb11727.x
Subject(s) - eutectic system , ternary operation , chemistry , ternary numeral system , phase diagram , mole fraction , phase (matter) , double salt , differential thermal analysis , analytical chemistry (journal) , salt (chemistry) , cryolite , nuclear chemistry , crystallography , inorganic chemistry , chromatography , microstructure , diffraction , organic chemistry , aluminium , physics , computer science , optics , programming language
The phase equilibrium diagram for the ternary fused‐salt system NaF–BeF 2 –UF 4 was based on evidence from differential thermal analysis, polarized light microscopy, and X‐ray examination of samples obtained from thermal‐gradient quenching studies and from high‐temperature filtration experiments. All the stable compounds in the binary systems NaF–BeF 2 and NaF–UF 4 displayed primary‐phase fields in the ternary system, including a new subsolidus compound which was observed and tentatively assigned the formula NaF · 4UF 4 . No ternary compounds or solid solutions were observed. The following three eutectics were found in the ternary system: (1) 72.5 NaF, 17.0 BeF 2 , and 0.5 mole % UF 4 at 486°C, (2) 56.0 NaF, 43.5 BeF 2 , and 10.5 mole % UF 4 at 339°C, and (3) 43.5 NaF, 56.0 BeF 2 , and 0.5 mole % UF 4 at 345°C.