Chemistry Reference
In-Depth Information
+
Copper (s)
Gold (s)
750-Red gold (s)
Cu
Au
Cu
1
Au
1
+
Copper (s)
+
Gold (s)
500-Red gold (s)
+
Au
3Cu
Cu
3
Au
1
Fig. 10.14 CuAu and Cu
3
Au super structures of red-gold alloys [
14
]
Miscibility gap
92
only pure substances
total Miscibility gap
Fig. 10.15 Examples for composition bands and miscibility gaps for mixtures of metals
ratio. For ratios of Cu atoms and Au atoms of 1:1 or 3:1 exactly, the atoms do not
form a random distribution in the mixed crystals, but rather order periodically [
14
]:
they form line phases with super structures (see Fig.
10.14
).
If metals with different lattice structures alloy, substitutional mixed crystals of
both structures as well as miscibility gaps may occur: composition bands for the
examples nickel-iron and lead-tin describes this behavior (see Fig.
10.15
). A 100%
