I-Pb (Iodine-Lead)
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ection III: Supplemental Literature Review
I-Pb (Iodine-Lead) H. Okamoto
The Pb-I phase diagram was unknown in [Massalski2], which was published in 1990. Since then, [1995Kon] determined the phase diagram in the region between Pb and PbI2 by differential thermal calorimetry. Figure 1 shows the Pb-I phase diagram of [1995Kon] revised by [2006Zhu]. A minor modification was made by this editor to avoid phase rule violation. In the phase diagram of [2006Zhu], PbI2 was shown to have a homogeneity range expanding to the I-rich side as the temperature increases. The syntectic melting reaction of
Table 1 Phase
PbI2 was shown as a congruent type in the phase diagram of [1995Kon]. Figure 1 may need confirmation because the L1 + L2 miscibility gap is very close to the edge of the phase diagram, which is unlikely [1991Oka]. The syntectic melting of PbI2 is also subject to further investigation because the syntectic reaction is unlikely to occur in binary systems unless the composition of the compound is very close to either side of the liquidus at the syntectic temperature [1993Oka]. Table 1 shows Pb-I crystal structure data.
Pb-I crystal structure data Composition, at.% I
Pearson symbol
Space group
Strukturbericht designation
Prototype
0 66.7
cF4 hP6
Fm3m P3m1
A1 ...
Cu ...
(Pb) PbI2
Weight Percent Iodine 0
10
20
30
40
50
60
70
80
90
100
450
L3
L2
406°C
Temperature, °C
400
L1 368°C
350
327.502°C
PbI2
300
250 0
Pb Fig. 1
320
10
20
30
40
50
60
70
80
Atomic Percent Iodine
Pb-I phase diagram
Journal of Phase Equilibria and Diffusion Vol. 31 No. 3 2010
90
100
I
Supplemental Literature Review: Section III References 1991Oka: H. Okamoto and T.B. Massalski, Thermodynamically Improbable Phase Diagrams, J. Phase Equilib., 1991, 12(2), p 148-168 1993Oka: H. Okamoto and T.B. Massalski, Guidelines for Binary Phase Diagram Assessment, J. Phase Equilib., 1993, 14(3), p 316-335
1995Kon: R.J.M. Konings, A. Kok-Scheele, and E.H.P. Cordfunke, On the Phase Diagrams of the Systems Pb-PbI2, PbI2-NaI and PbI2-ZnI2, Thermochim. Acta, 1995, 261, p 221-225 2006Zhu: X.H. Zhu, B.J. Zhao, S.F. Zhu, Y.R. Jin, Z.Y. He, J.J. Zhan, and U. Huang, Synthesis and Characterization of PbI2 Polycrystals, Cryst. Res. Technol., 2006, 41(3), p 239-242
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