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Section III: Supplemental Literature Review

Au-Tb (Gold-Terbium) H. Okamoto

The Au-Tb phase diagram in [Massalski2] was redrawn from [1987Gsc]. This diagram was mostly speculative due to lack of experimental data. Table 1 Phase (Au) Au6Tb Au51Tb14 Au3Tb Au2Tb Au10Tb7 Au4Tb3 bAuTb aAuTb AuTb2 (bTb (aTb)

Figure 1 shows the Au-Tb phase diagram determined by [2000Sac] based on differential thermal analysis, x-ray diffraction, optical microscopy, scanning electron microscopy, and electron probe microanalysis. Two new intermetallic compounds (Au10Tb7 and Au4Tb3) unknown in [Massalski2] were discovered. Table 1 shows Au-Tb crystal structure data.

Au-Tb crystal structure data Composition, Pearson at.% Tb symbol 0 14.3 21.5 25 33.3 41.2 42.9 50 50 66.7 100 100

Space group

Strukturbericht designation Prototype

Fm3m P42/ncm P6/m Pmmn I4/mmm I41/acd R3 Pm3m Cmcm Pnma Im3m P63/mmc

cF4 tP56 hP65 oP8 tI6 tI136 hR42 cP2 oC8 oP12 cI2 hP2

A1 … … D0a C11b … … B2 Bf C23 A2 A3

Cu Au6Ho Ag51Gd14 bTiCu3 MoSi2 Au10Gd7 Pu3Pd4 CsCl CrB Co2Si W Mg

References 1987Gsc: K. Gschneidner, Jr., F.W. Calderwood, H. Okamoto, and T.B. Massalski, The Au-Tb (Gold-Terbium) System, Phase Diagrams of Binary Gold Alloys, H. Okamoto and T.B. Massalski, Eds., ASM International, Metals Park, OH, 1987, p 294-297 2000Sac: A. Saccone, D. Maccio`, S. Delfino, and R. Ferro, The Phase Diagram of the Terbium-Gold System, Intermetallics, 2000, 8, p 229-237

Weight Percent Terbium 0

10

20

30

40

50

60

70

80

90

100

1800

βAuTb

1600

L

1590°C

1450°C

(βTb)

1400 1265°C

91.5

1210°C

1175°C

1356°C 1289°C

1215°C 1200

1195°C

1210°C

1160°C 1064.43 1000°C

1000

71 12

880°C

855°C

80

AuTb2

αAuTb

600

Au4Tb3

Au6Tb

11

Au10Tb7

800

Au2Tb

805°C

Au51Tb14 Au3Tb

Temperature, °C

41 1340°C

(αTb)

(Au) 400 0

Au

10

20

30

40

50

60

70

80

90

Atomic Percent Terbium

Fig. 1 Au-Tb phase diagram

286

Journal of Phase Equilibria and Diffusion Vol. 29 No. 3 2008

100

Tb