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JPEDAV (2007) 28:494 DOI: 10.1007/s11669-007-9149-z 1547-7037
ASM International

Ga-Pt (Gallium-Platinum) H. Okamoto

The Ga-Pt phase diagram in [Massalski2] (solid lines in Fig. 1) was thermodynamically assessed by [2006Li]. The result is shown with dashed lines in Fig. 1. The phase boundary data adopted by [2006Li] in their assessment were essentially the same as those adopted by [Massalski2] from [1976Gue]. Noticeable differences between [Massalski2] and [2006Li] are as follows:

bGaPt3 and aGaPt3 : These phases were not taken into account by [2006Li]. (Pt): Experimental data are not available to support either [Massalski2] or [2006Li].

References 1976Gue: P. Guex and P. Feschotte, Binary Systems PlatinumAluminum, Platinum-Gallium, and Platinum-Indium, J. LessCommon Met., 1976, 46(1), p 101-116, in French 2006Li: M. Li, F. Wang, and W. Zhang, Thermodynamic Assessment of the Ga-Pt System, Intermetallics, 2006, 14(7), p 826831

GaPt liquidus: The [Massalski2] diagram is too asymmetric. [2006Li] is more likely although [Massalski2] agrees better with available experimental data. Ga3Pt5: [2006Li] assumes a line compound whereas [Massalski2] shows ~5 at.% solubility range. This disagreement must be settled experimentally. cGaPt3: The difference in the width must be examined experimentally.

Weight Percent Platinum 0

10

20

30

50

40

60

80

70

90

100

1800

1769.0°C

Massalski2 2006Li

1600

1400

1374

L

78 61

1104°C 1000

1149°C 1142°C

(Pt)

56 58

937°C 32 34 922°C 822°C

800

62

1017°C

21

Ga3Pt5

GaPt2

GaPt

400

Ga3Pt2

Ga7Pt3 Ga2Pt

600

γGaPt3

Temperature, °C

1200

1361°C 86

(Ga)

153°C

28°C

29.7741°C 0 0

Ga

10

20

30

40

50

60

70

255°C

αGaPt3

Ga6Pt

200

βGaPt3

290°C 3

80

210°C

90

Atomic Percent Platinum

Fig. 1 Ga-Pt phase diagram

494

Journal of Phase Equilibria and Diffusion Vol. 28 No. 5 2007

100

Pt