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Composition / %
50
40
30
20
10
0
0
T / K
0
100
T / K
0
x / m
%
× 10
-10
m
2
s
-1
× 10
-6
m s
-1
K / m
Critical gradient
Extent of undercooled region
Partition coefficient
C
0
D
L
v
d
T
/d
x
0.001
1040
950
0.001
1040
950
under-
cooled
region