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Phase Diagrams & Computational Thermodynamics

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Ag-Pb-Sn System

Calculated Liquidus Projection

Liquidus Projection with Isotherms of the Ag-Pb-Sn System (112 KB)

Status of the thermodynamic description:

Extrapolated from binary thermodynamic descriptions

Sources of the binary descriptions:

Ag-Pb:  B.-Z. Lee, C.-S. Oh and D.N. Lee, J. Alloys & Compds. 215 (1994) 293-301

Ag-Sn:  C.-S. Oh, J.-H. Shim, B.-J. Lee and D.N. Lee, J. Alloys & Compds. 238 (1996) 155-166  

Pb-Sn:  H.J. Fecht, M.-X. Zhang, Y.A. Chang and J.H. Perepezko, Metall. Trans. A, 20A (1989) 795-803

Calculated Invariant Equilibria

Reaction Phase Mass % Ag Mass % Pb Mass % Sn
L   +   (Ag)   ->   (Pb)   +   (zeta Ag)

307.8 oC

 Liquid 1.80 98.02 0.18
(Ag) 89.21 0.78 10.01
(Pb) 0.08 99.80 0.12
(zeta Ag) 87.98 0.12 11.90
L   +   (zeta Ag)   ->   (Pb)   +   Ag3Sn

307.2 oC

 Liquid 1.38 96.18 2.44
(zeta Ag) 80.26 0.05 19.69
(Pb) 0.06 98.35 1.59
Ag3Sn 73.17 0 26.83
L   ->   Ag3Sn   +   (Pb)   +   (Sn)

177.3 oC

 Liquid 1.50 36.34 62.16
Ag3Sn 73.17 0 26.83
(Pb) 0.01 82.34 17.65
(Sn) 0.04 3.24 96.72

Phases, Crystal Structures and Model Descriptions

Phase Struktur-
bericht
Symbol		 Common Names Prototype Spacegroup Model*
 
Liquid n/a L, L1, L2 n/a n/a (Ag,Pb,Sn)1
 
Fcc A1 (Ag), (Pb) Cu Fm-3m (Ag,Pb,Sn)1(Va)1
Hcp A3 (zeta Ag), (epsilon Pb) Mg P63/mmc (Ag,Pb,Sn)1(Va)0.5
Bct A5 (Sn), (beta Sn) beta Sn I41/amd (Ag,Pb,Sn)1
 
Ag3Sn D0alpha epsilon beta Cu3Ti Pmmn (Ag)0.75(Sn)0.25

*Major species are printed bold face

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