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Supplemental Literature Review: Section III

Al-Pd (Aluminum-Palladium) H. Okamoto

The Al-Pd phase diagram in [Massalski2] (from [1986Mca]) was revised by [2003Oka] in the 0-40 at.% Pd range based on new experimental data provided by [2001Yur]. [2006Li] assessed the Al-Pd system thermodynamically by primarily using the phase boundary data given by [1986Mca] and [2001Yur]. The calculated phase diagram is shown in Fig. 1. [1986Mca] showed two low-temperature forms of AlPd, i.e., l below 740
C and b¢ below 850
C, but these phases were not taken into account by [2006Li] because the boundaries of these phases have not been well established. Table 1 shows Al-Pd crystal structure data.

References 1986Mca: A.J. McAlister, The Al-Pd (Aluminum-Palladium) System, Bull. Alloy Phase Diagrams, 1986, 7(4), p 368-374 2001Yur: M. Yurechko, A. Fattah, T. Velikanova, and B. Grushko, A Contribution to the Al-Pd Phase Diagram, J. Alloys Compds, 2001, 329, p 173-181 2003Oka: H. Okamoto, Al-Pd (Aluminum-Palladium), J. Phase Equilib., 2003, 24(2), p 196

2006Li: M. Li, C. Li, F. Wang, and W. Zhang, Thermodynamic Assessment of the Al-Pd System, Intermetallics, 2006, 14(1), p 39-46

Table 1 Phase (Al) Al4Pd Al3Pd Al21Pd8 Al3Pd2 AlPd b¢ (a) l (a) Al3Pd5 AlPd2 Al2Pd5 (Pd)

Al-Pd Crystal Structure Data

Composition, Pearson Space Struktur bericht at.% Pd symbol group designation Prototype 0 20 25 27.6 39 to 41 44 to 56 48.5 to 52.8 48 to 49 62.5 65 to 72.5 70.5 to 71.5 81.1 to 100

cF4 hP* o** tI116 hP5 cP2 hR78 cF8 oP16 oP12 oP28 cF4

Fm3m P6322 ... I41/a P3m1 Pm3m R3 P213 Pbam Pnma Pbmn Fm3m

A1 ... ... ... D513 B2 ... B20 ... C23 ... A1

Cu ... ... Al21Pt8 Al3Ni2 CsCl ... FeSi Ge3Rh5 Co2Si Ga2Pd5 Cu

(a) Not shown in Fig. 1.

Fig. 1 Al-Pd phase diagram

Journal of Phase Equilibria and Diffusion Vol. 29 No. 2 2008

199