E/Ill Ce3Atl
LuNi 5 LuNi 3
Fig. 64. Lu-Ni-A1, partial isother- mal section at 1070K (0-33a/c Lu).
p o u n d s ( a f t e r R y k h a l et al. 1982) a r e : (1) - - L u 3 N i s A 1 ( C e 3 C o s S i ST, a = 4.985, c = 15.94); (2) - L u N i A 1 z ( M g C u A I 2 ST, a = 4.038, b = 9.875, c = 6.900); (3) LuNiA14 ( Y N i A I 4 ST, a = 4.023, b = 14.97, c = 6.630); (4) - - LuNi3A116 (un- k n o w n s t r u c t u r e w i t h t h e o r t h o r h o m b i c u n i t cell, a = 3.924, b = 15.40, c = 26.54);
( 5 ) - L u N i 2 A 1 3 (HoNi2.6A12. 4 ST, a = 9.00, c = 4.032); ( 6 ) - L u 3 N i 2 A 1 7 ( u n d e - t e r m i n e d c r y s t a l s t r u c t u r e w i t h h e x a g o n a l l a t t i c e , a = 17.85, c = 4.044); (7) L u N i A 1 ( Z r N i A 1 S T , a = 6.906, c = 3 . 7 4 8 ) , a n d (8) - - Lu2NizA1 ( M o z N i B 2 S T a = 5.623, b = 8.253, c = 4.124).
Lu-{Zr, Hf}-AI
N o t e r n a r y c o m p o u n d s (fig. 65) w e r e f o u n d b y T y v a n c h u k (1979).
A[
770
K / / ~
M = Z
' ~
Fig. 65. Lu-M-A1, schematic partial isothermal section at 770 K (100-66 a/c A1), where M = Zr, Hr.
42 E . I . G L A D Y S H E V S K Y et al.
TASLE 1
T e r n a r y c o m p o u n d s found in the p a r t i a l l y i n v e s t i g a t e d systems R - M - A 1 . In the tables, a s h o r t - h a n d n o t a t i o n for t h e r e f e r e n c e s has b e e n used: the first two letters of t h e s u r n a m e of the first a u t h o r h a v e b e e n t a k e n followed by initial l e t t e r of t h e surname(s) of his co-author(s). The references can be found
in the r e f e r e n c e list a c c o m p a n y i n g the section.
L a t t i c e p a r a m e t e r s
C o m p o u n d Structure type a b c Ref.
ScCoAI M g Z n 2 5.10 - 8.20 TeP, 65a
Sc6Co8Al15 Th6Mnz3 12.09 - - M a B , 69
Sc6RhI6A17 Mg6Ct1168i 7 . . . - - MaS, 71
Sc6Osl6A17 Mg6Cu16Si 7 . . . - - MaS, 71
Sc6Irl6ml 7 Mg6Cux68i 7 . . . - - MaS, 71
YM%A14 YbMo2A14 6.748 - 5.331 G r R , 86
Y R e 4 A I 8 CeMn4A18 9.02 - 5.22 R y Z , 74
LaCoA1 . . . . . . . . . . . . Oe, 71
La3CosA12 . . . . . . . . . . . . E m , 71b
L a 3 C o 4 a l 3 . . . . . . . . . . . . E m , 71b
La3COls_lsA18_5 . . . . . . . . . . . . E m , 71b
LaCoA14 LaCoA14 4.07 7.70 7.07 R y Z Y , 77
L a C o z A l 7 . . . . . . . . . . . . E m , 71b
LaNil.5_l.2Alo.5_o 8 . . . . . . . . . . . . E m , 71b
LaNiA1 . . . . . . . . . . . . Oe, 73
LaNio.9-o.76All.1 1 . 2 4 . . . . . . . . . . . . E m , 71b
LaNi2AI 5 PrNizA15 7.033 9.677 4.021 Ya R A Z , 81
LaNi~_4AI8_ 9 NaZnl3 11.72- - - E m , 71b
11.78
La2Niz.25A10.75 Mo2NiB 2 5.620 8.585 4.378 R o G Y Z S , 82b
La4SnA17 A1B 2 4.474 - 4.397 RaS, 67
L a R e 4 A I 8 CeMn4A18 9.08 - 5.19 R y Z , 74
CegNi2.~sA10.85 M % N i B 2 5.331 8.413 4.241 R o G Y Z S , 82b
C e ( Z n , A1)4 B a A t 4 4.45 - 11.02 Z a , 64
CesSn3AI13 AIB z 4.454 - 4.284 RaS, 67
CeRe4A18 CeMn4A18 9.06 - 5.15 R y Z , 74
PrV2AI2o CeCr2A120 14.58 - - K r Z , 68
PrCr4A1 s CeMn4AI 8 9.033 - 5.128 BuV, 76
PrCr2A12o CeCrzA120 14.43 - - K r Z , 68
PrMn4A18 CeMn4AI 8 8.962 - 5.143 BuV, 76
PrFe4A18 CeMn4AI 8 8.796 - 5.056 BuV, 76
PrCol.6Al0. 4 . . . . . . . . . . . . OeW, 67
PrCoA1 . . . . . . . . . . . . Oe, 71
PrCoA14 L a C o A I , 4.05 7.59 6.99 R y Z Y , 77
P r G e A I a - T h S i 2 4.273 - 14.63 Rya, 74
PrGe2AI 2 L a 2 0 2 S 4.264 - 6.896 Z a M G , 70b
NdV2A12o CeCr2A12o 14.57 - - K r Z , 68
NdCr2Al20 CeCr2Al2o 14.41 - - K r Z , 68
NdCoA1 . . . . . . . . . . . . O e , 71
N d G e A I a - T h S i 2 4.272 - 14.66 R y a , 74
NdGe>0.75AlI_L25 A1B z 4 . 2 9 8 - - 4 . 2 1 0 - RaS, 67
4.308 4.204
NdGe2A12 L a 2 0 2 S 4.265 - 6.827 Z a M G , 70b
NdRe4A18 C e M n a A I 8 9.03 - 5.14 R y Z , 74
SmCoA1 . . . . . . . . . . . . Oe, 71
T E R N A R Y R A R E E A R T H SYSTEMS W I T H M E T A L L I C E L E M E N T S
TABLE 1 (cont'd)
43
Compound
Lattice parameters
Structure type a b c Ref.
SmzNi2A1 SmNiAI Sm3Ni8A1 SmGeA1 SmG%A12
EuMna 3 3.6Allo.7_8.4 EuFe4A18
EuFe2AI 8 EuCuAI EuCu4A18
EuCu6.2 9AA16.8_3.9
EuGe2A12 GdV2AI2o GdCr2A120 GdCr4A18 GdMn4A18 GdCoAt GdCuA1 GdCu4A1 , GdMo2AI 4 T b C o A I TbCuA1 TbGeA1 TbGe2A12 TbMo2A14 DyCoA1 DyCuA1 D y G e A I DyGe2A12 DyMozA14 HoCr2A120 H o C o A I H o C u A I HoGeA1 HoGe2A12 HoMo2A14 ErCr2A12o ErCr4A18 ErMn4A18 ErCoA1 ErCuA1 ErCu~A18 ErGeA1 ErGe2A12 ErMo2A14 TmFeA1 TmFe4A18
MoeNiB z 5.414 8.424 4.221
ZrNiAI 6.982 - 4.008
Ce3CosSi 5.082 - 16.19
a -ThSi a 4.188 - 14.52
La202S 4.233 - 6.805
ThMn12 9.095- - 5.142-
8.974 5.130
CeMn4A18 8.846 - 5.084
CeFe2AI 8 12.530 14.503 4.036
ThMn22 8.902 - 5.105
NaZn13 11.960- - -
11.828
La202S 4.22 - 7.31
CeCr2Al2o 14.56 - -
CeCr2Al2o 14.41 - -
CeMn4A18 8.967 - 5.128
CeMn4A18 8.887 - 5.119
M g Z n z 5.370 - 8.571
ZrNiA1 7.078 - 4.065
CeMn4A18 8.748 - 5.146
YbMozA14 6.780 - 5.331
M g Z n 2 5.370 - 8.512
ZrNiA1 7.041 - 4.044
DyGeA1 4.121 10.52 5.831
La202S 4.24 - 6.63
YbMo2A14 6.759 - 5.319
M g Z n 2 5.342 - 8.497
ZrNiA1 7.023 - 4.030
D y G e A I 4.091 10.46 5.902
LazO2S 4.21 - 6.67
YbMozA14 6.742 - 5.318
CeCrzAl20 14.39 - -
M g Z n 2 5.336 - 8.487
ZrNiA1 6.997 - 4.015
DyGeA1 4.123 10.40 5.827
La202S 4.196 - 6.668
YbMo2A14 6.734 - 5.317
CeCr2A12o 14.38 - -
CeMn4A18 8.901 - 5. !23
CeMn4AI 8 8.892 - 5.117
MgZn 2 5.305 - 8.469
ZrNiA1 6.974 - 4.002
CeMnnA18 8.691 - 5.119
DyGeA1 4.101 10.34 5.840
La202S 4.184 - 6.662
YbMo2A14 6.722 - 5.317
M g Z n 2 5.32 - 8.67
CeMn4A18 8.695 - 5.015
Ry, 78 D w M C D K , 68 Ry, 78 Rya, 74 Z a M G , 70b MaYZ, 86 ViZ, 74 MaSKZY, 83a Oe, 73 MaYZ, 83b MaYZ, 83b Z a M G , 70b KrZ, 68 KrZ, 68 BuV, 76 BuV, 76 Oe, 71 D w M C D K , 68 BuV, 76 FoP, 76 Oe, 71 Oe, 73 Rya, 74 Z a M G , 70b G r R , 86 Oe, 71 D w M C D K , 68 Rya, 74 Z a M G , 70b G r R , 86 KrZ, 68 Oe, 71 D w M C D K , 68 Rya, 74 Z a M G , 70b G r R , 86 KrZ, 68 BuV, 76 BuV, 76 Oe, 71 D w M C D K , 68 BuV, 76 Rya, 74 Z a M G , 70b FoP, 76 ZaRV, 73 BuV, 76
44 E.I. GLADYSHEVSKY et al.
TABLE 1 (cont'd)
Lattice parameters
Compound Structure type a b c Ref.
TmCoA1 MgZn 2 5.276 - 8.435 Oe, 71
TmGeA1 DyGeA1 4.02 10.33 5.865 Rya, 74
TmGe2AI 2 LazO2S 4.18 - 6.65 ZaMG, 70b
TmMo2A14 YbMo2AI 4 6.719 - 5.309 GrR, 86
YbCr4AI 8 CeMn4A18 8.710 - 5.110 B u V , 76
YbMn4AI 8 CeMn4A18 8.819 - 5.084 B u V , 76
YbFeAI . . . . . . . . . . . . Oe, 71
YbFeeA18 CeMn4A18 8.706 - 5.004 B u V , 76
YbCoAI MgZn 2 5.296 - 8.466 Oe, 71
YbNiAI . . . . . . . . . . . . Oe, 73
YbNiAI 2 MgCuAt 2 4.065 10.03 6.97 RoZRYS, 82a
Yb2Ni~AI Mo2NiB 2 5.614 8.314 4.087 RoGYZS, 82b
YbCuA1 ZrNiA1 6.926 - 3.986 DwMCDK, 68
YbCu4A18 CeMn4A18 8.710 - 5.110 B u V , 76
YbGeAl DyGeA1 4.307 10.57 5.935 Yan, 75
YbGezAI 2 LazOzS 4.118 - 7.05 ZaMG, 70b
YbMo2A14 YbMo2AI 4 6.717 - 5.312 FoP, 76
LuFeAI ZrNiA1 6.926 - 3.896 DwMCDK, 68
LuFe4A18 CeMn4A18 8.687 - 4.982 B u V , 76
LuCoA1 MgZn 2 5.261 - 8.399 Oe, 71
LuCuA1 ZrNiA1 6.926 - 3.896 DwMCDK, 68
LuGe2A12 La202S 4.17 - 6.63 ZaMG, 70b
LuMozA14 YbMozA14 6.695 - 5.311 GrR, 86
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2.2. R - M - G a systems
Phase equilibria have been investigated in 30 ternary systems, and the existence of 210 ternary rare earth gallides was established. For 127 of them the crystal structure was solved. The investigation of another 59 ternary systems was carried out only partially- without deriving the phase diagrams. As the result of this study a total of 261 additional ternary compounds have been found, their compositions and crystallographic data for are given in table 2.
S c - T i - G a
The phase diagram (fig. 66) was derived by Gavrylenko and Markiv (1978a). A total of three ternary compounds was found. The crystal structure was solved by Gryn et al. (1980a) only for the ( 1 ) - S c T i 2 G a 4 (YbMo2A14 ST, a =6.578, c = 5.475).
S c - V - G a
An investigation of the ternary system Sc-V-Ga was performed by Savitzky et al. (1978a). The phase diagram is shown in fig. 67. The only ternary compound, ScV2Ga4, belongs to the YbMo2A14 ST, with a = 6.482, c = 5.216.
48 E.I. G L A D Y S H E V S K Y et al.
Ga
1070 K / X
Ti O o 3 / / ~ ~ S c Ga 3 ZiG a 2 ~ = = = z ~ S c G a 2 T i 2 G a ~ c 2 G e 3
miGa ~ " ~ S s G c a G
Ti5Ga 3 - Sc5Ge 3
T i 2 G a ~ ~ /~~Sc2bO
Ti
ScFig. 66. S c - T i - G a , isothermal sec- tion at 1070 K. T e r n a r y c o m p o u n d s with u n k n o w n crystal structure:
(2) -- Scl_4Ti4_lGa3; (3) ~ Sc2_2.37- TiGa3_2.63.
S c - C r - G a
The only ternary compound, Scl.3Cr0.7Ga, with unknown crystal structure was found by Gavrylenko and Markiv (1978a) during a phase diagram study of the system S c - C r - G a (fig. 68).
S c - M n - G a
Gavrylenko and Markiv (1978b) derived the isothermal section at 770 K, shown in fig. 69, and found three ternary compounds: (1) - ScMnGa2; (2) ~ Sc4MnGa6, and ( 3 ) - Sc7Mnt.2Ga0. 8. Crystal structure of all of them are undetermined.
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