ORNL-1816 - the Molten Salt Energy Technologies Web Site

TABLE 5.7. PHASES FOUND IN MF-LaF, BINARY MIXTURES
PERIOD ENDING DECEMBER 10, 1954
Sample
Number
Ma I or
Composition
Structure Type
Hexagonal Latcfice
Dimensions (A)
0 bserved Reported31
LMB-108
- 109
-110
-107
-131
1NaF-lLaF3
3KF-1LaF3
3K F- 1L aF3
lKF-1LaF3
1 K F- 1 La Fg
P2-NaL aF4
Pl-KLaF4 (and unknown
phase)
One phase, predominantly
(same as unknown above)
*Za~hariasen;~’ the quantity given is the number of molecules per unit cell.
a = 6.17
c = 3.82
a = 6.52
c = 3.79
a = 6.52
c = 3.79
a = 6.52
c = 3.79
a = 6.167
c = 3.819
a = 6.524
c = 3.791
a = 6.524
c = 3.791
a = 6.524
c = 3.791
lattice constants able 5.7). The expected yi ed the data shown in Table 5.8. The in-
complex phase is found in the NaF-LaF, system. terpretation was aided greatly by comparing these
The x-ray analysis of the KF-LaF, fusion (Table diffraction patterns with the corresponding LaF,
5.7, sample LMB-107) indicates the presence of salts. The Greek letter assignment is adopted to
pl-KLaF, and an unknown second phase. A correspond with the lanthanum compounds 13s given
second fusion at this composition (sample LMB- by Zachariasen.
131), with an imposed slower rate of cooling, gives The ternary salt mixture 1 KF-1 NaF-2 UF,
predominantly a single phase which corresponds gives the phase P2 c(K,Na)UF,. Here the ordering
to the unknown structure found in the previous requires a doubling of the c axis observed in the
preparation. For the 3KF-LaF3 composition, only P2-phase of the binary salt. The extent of the
this melt indicates that the
lized by the greater concen-
Rep. Se t. 10, 1952, ORNL-1375, p 79; V. S. Coleman,
w. C. Wiitley, and C. J. Barton, ANP Quar. Prog. Rep.
Dec. 10, 1952, ORNL-1439, p 109.
33DetaiIs of this work will be published in separate
reports and articles by the Chemistry Division.
Z*
3
4
%
!2
3
73