the Molten Salt Energy Technologies Web Site

ANP PROJECT QUARTERLY PROGRESS REPORT
sys tem NaF-A1F3 and KF-AlF, reported
in the literature(') are 685 and
570°C, respectively. The tentative
equilibrium diagram shown in Fig. 10.5
indicates that in the ternary system
no melting points lower than 570°C are
avai 1 ab1 e.
NaF-BeF,-ZrF,. Thermal data were
obtained from cooling curves for about
25 compositions in the NaF-SeF,-ZrF,
system. Many of the compositions
studied were within the NaF-NaZrF5 -
NaBeF3 part of the diagram. The
lowest melting point observed was
(7)F. T. Hall and H. Insley, J. Am. Cera.. SOC.
Nor. 1947, Supplement.
114
Fig. 10.5. The System NaF-KF- AlF,.
375°C: for a mixture containing 5 mole
% ZrF,, 40 mole % BeF2, and 55 mole %
NaF. It appears that a ReF, concen-
tration of approximately 20 mole % is
needed to obtain a melting point
substantially lower than that of
NaZrF5 (510 "C) .
NaF-LiF-ZrF,. The NaF-LiF-ZrF,
system has been studied fairly in-
tensively, especially in the 30 to 50
mole % ZrF4 range in which the lowest
melting points occur. The lowest
melting point obtained was 426OC for
the mixture containing 20 mole % LiF,
40 mole % NaF, and 40 mole % ZrF,.
Isotherms cannot be prepared for this
890°C