* GULISTON DAVLAT UNIVERSITETI AXBOROTNOMASI,
Tabiiy va qishloq xo‘jaligi fanlari seriyasi. 2021. № 1
10
above 231
С Ga and Sn are in a molten state, at temperatures 750
650
С the solubility of Ga in Sn is
unlimited. At temperatures of 750
650
C, the solubility of As in Sn varies from 85 to 70 at.% (See
Fig. 3 b). Consequently, if GaAs molecules decompose into separate Ga and As atoms upon
dissolution of GaAs in Sn, then the solubility of GaAs in Sn should be at least 70 mol.% At 750 - 650
° C. It is known that the solubility of GaAs in Sn is very limited, and changes from ~ 2.6 to ~ 5.5
mol.% When the temperature changes from 650 to 750
С (Fig. 2, a), this indicates that dissolved
GaAs in tin solution-melt does not decompose into individual Ga and As atoms, but is mainly in the
form of GaAs molecules. This is clearly seen in Fig. 4.
а) b)
с) d)
Fig. 3. State diagrams of the binary system Ga-Sn (a), As-Sn (b), Zn-Sn (c) and Sn-Se (d).
Similarly from Fig. 3 s it can be seen that at temperatures above 420
С Zn and Sn are in a
molten state, the solubility of Zn in Sn at 650-750
С is unlimited. It can be seen from the Sn-Se phase
diagram that when Se dissolves in Sn, the Se solubility at 650-750
C varies within the range from ~ 5
to ~ 12 at.% (Fig. 3d, tin angle of the phase diagram). Whereas, the solubility of ZnSe in Sn at 650-
750
C varies from ~ 0.2 to 0.35 mol.% (See Fig. 2). Consequently, as in the case of GaAs, ZnSe in Sn
at 650-750°C is mainly in the form of ZnSe molecules, as shown in Fig. 5.
231
29,8
0
20
40
60
80
100
100
200
T,
C
L
Ga
Sn, at.%
Sn
T,
C
200
400
600
800
L
As
Sn, at.%
Sn
0
20
40
60
80
100
231
200
T,
C
0
20
40
60
80
100
Zn
Sn, at.%
Sn
300
400
L
T,
C
0
20
40
60
80
100
Sn
Se, at.%
Se
200
400
600
800
L
1
+ L
2
L
L
L
1
+L
2
Do'stlaringiz bilan baham: |