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Binary Systems

The liquidus of the system Ag-Tl [76Zim2] (Fig. 1) and some phase boundaries of the system Tl-Bi [78Kri] (Fig. 2) are slightly different from those assumed by [H]. For Ag-Bi the diagram of [H] is accepted.

Solid Phases

Except for the (Ag) solid solution in equilibrium with liquid, the extension into the ternary system is very small (see Table 1).

Invariant Equilibria

Invariant equilibria are given in Table 2 and Fig. 3.

Liquidus Surface

The liquidus surface is given in Fig. 4.

Isothermal Sections

The isothermal section at 200C is given in Fig. 5.

References

[76Zim1]
B. ZIMMERMANN, "Rechnerische und Experimentelle Optimierung von Binären und Ternären Systemen aus Ag, Bi, Pb and Tl", Thesis, Universität Stuttgart, Germany (1976) (Equi. Diagram, Thermodyn., Experimental, #, 95)

[76Zim2]
B. ZIMMERMANN, E.-TH. HENIG and H.L. LUKAS, "Das System Ag-Bi-Tl, Berechnet aus den Optimierten Binären Randsystemen", Z. Metallkde., 67, 815-820 (1976) (Equi. Diagram, Thermodyn., Experimental, #, *, 13)

[78Kri]
H. KRIEG, "Experimentelle und Rechnerische Bestimmung des Systems Bi-Pb-Tl", Diplomarbeit, Universität Stuttgart (1978) (Equi. Diagram, Experimental, 13)

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Table 1: Solid Phases

Phase/  Temperature Range (°C)	Pearson  Symbol/ Prototype	Lattice Parameters (pm)	Comments
(Ag)	cF4 Cu	a = 408.62	pure element 25C [P]
(Bi)	hR2  As	a = 454.6 c = 1186.2	pure element 25C [P]
(Tl)(h)	cI2 W	a = 388.2	pure element 262C [P]
(Tl)(r)	hP2  Mg	a = 345.66 c = 552.48	pure element 18C [P]
Tl3Bi	cF4 Cu	a = 491.4	at 79.9 at.% Tl [P]
Tl2Bi3	hP3 B2Al	a = 566.3  c = 337.8	[P]

Table 2: Invariant Equilibria

T (°C) Reaction	Type	Phase	Composition (at.%)      Ag         Bi          Tl
289.3  L+Tl3Bi ↔ (Ag)+(Tl)(h)	U1	L (Ag)  (Tl)(h)  Tl3Bi	2.3        5.8      91.9    95.5        0.0        4.5     0.0        6.0      94.0      0.0        7.5      92.5
197.3  L ↔ (Ag)+(Bi)+Tl2Bi3	E1	L (Ag) (Bi) Tl2Bi3	2.2      75.0      22.8   99.7        0.2        0.1     0.0    100.0        0.0     0.0      69.4      30.6
187.8  L ↔ (Ag)+Tl3Bi+Tl2Bi3	E2	L  (Ag) Tl3Bi Tl2Bi3	1.1      46.8      52.1   99.6        0.1        0.3     0.0      40.5      59.5     0.0      55.1      44.9
~144 (Tl)(h) ↔ Tl(r)+Tl3Bi(Ag)	D1	(Tl)(h) (Tl)(r) Tl3Bi (Ag)	0.0        2.3      97.9     0.0        1.3      98.7     0.0        5.3      94.7 100.0        0.0        0.0

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