Question

(a) Antimony-bismuth is an alloy which finds applications in semiconductor and thermoelectric devices. The phase diagram for the antimony-bismuth system is shown below. A sample of composition 60 wt% Sb is made up at held at 400 °C. Based on this information and the phase diagram below, answer the following questions: (i) What is the melting point of pure bismuth (Bi) and antimony (Sb)? (i) What is the composition of any solid phase present? (ii) What is the composition of any liquid phase present? (iii) How much of each phase is present? 650- 600- 550- Liquid (L) Temperature (°C) 500- 450- $\alpha$ + L 400- 350- 300- Solid ($\alpha$) 250- 200- 0 10 20 30 40 50 60 70 80 90 100 Bi Composition (wt% Sb) Sb [17 marks]

          (a)
Antimony-bismuth is an alloy which finds applications in semiconductor and
thermoelectric devices. The phase diagram for the antimony-bismuth system is
shown below. A sample of composition 60 wt% Sb is made up at held at
400 °C. Based on this information and the phase diagram below, answer the
following questions:
(i)
What is the melting point of pure bismuth (Bi) and antimony (Sb)?
(i)
What is the composition of any solid phase present?
(ii)
What is the composition of any liquid phase present?
(iii)
How much of each phase is present?
650-
600-
550-
Liquid (L)
Temperature (°C)
500-
450-
$\alpha$ + L
400-
350-
300-
Solid ($\alpha$)
250-
200-
0
10
20
30
40
50
60
70
80
90
100
Bi
Composition (wt% Sb)
Sb
[17 marks]

(a)
Antimony-bismuth is an alloy which finds applications in semiconductor and
thermoelectric devices. The phase diagram for the antimony-bismuth system is
shown below. A sample of composition 60 wt% Sb is made up at held at
400 °C. Based on this information and the phase diagram below, answer the
following questions:
(i)
What is the melting point of pure bismuth (Bi) and antimony (Sb)?
(i)
What is the composition of any solid phase present?
(ii)
What is the composition of any liquid phase present?
(iii)
How much of each phase is present?
650-
600-
550-
Liquid (L)
Temperature (°C)
500-
450-
α + L
400-
350-
300-
Solid (α)
250-
200-
0
10
20
30
40
50
60
70
80
90
100
Bi
Composition (wt% Sb)
Sb
[17 marks]

Added by Nicol-S H.

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