the Molten Salt Energy Technologies Web Site

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OWG 17405
PERIOD ENDING DECEMBER 10, 1952
NaF io 20 30 40 50 60 50 00 90 ZtF4
Na,ZrF, NoZZrF6 NoZrF5 NoZr2 Fs( 7 )
Fig. 10.4. The
composition of the compound that is
believed to exist between NaZrF5 and
ZrF, ; (2) the possible solid solution
formation between NaZrFS and Na2ZrF6 ;
(3) the significance of the thermal
effect at 525°C in the 33 to 38 mole %
ZrF, region, which may indicate
polymorphism of Na2ZrF, or, possibly ,
a compound such as Na,Zr,F1,; (4) the
peculiar behavior (marked expansion
an freezing) of mixtures in the region
of the eutectic at 43 mole % ZrF,.
LiF-ZrF,. Study of the LiF-ZrF,
system has been attended by some of
thedifficulties mentioned in connection
with the MaF-ZrF, SYS tem. A1 though
ZrF, (mole%)
system NaF- ZrF,.
thermal data have been obtained for a
number o f compositions in the 10 to
70 mole % ZrF, range, the melting
points of some compositions are still
uncertain. It is clear, however, that
this systemis quite different irom the
other alkali fluoride-zirconium
fluoride systems that have been
studied. The minimum-me1 ting-point
composition appears to be close to
50 mole % ZrF,, with a melting point
of about 510°C. The solid phases in
this system have received little
attention, as yet.
NaF-KF-AlF,. The lowest melting-
point compositions in the binary
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