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Section III: Supplemental Literature Review

Pr-Yb (Praseodymium-Ytterbium) H. Okamoto

Reference

The Pr-Yb phase diagram was unknown in [Massalski2]. A schematic Pr-Yb phase diagram shown in Fig. 1 was proposed by [1999Gio] by assuming close similarity of this system to the Nd-Yb system. Pr-Yb crystal structure data are shown in Table 1.

Table 1

1999Gio: M. Giovannini, A. Saccone, and R. Ferro, The Isothermal Section at 450
C of the Yb-Pr-Mg System, Intermetallics, 1999, 7, p 909-916

Pr-Yb crystal structure data

Phase

Composition, at.% Yb

Pearson symbol

Space group

Strukturbericht designation

Prototype

(bPr) (aPr) (cYb) (bYb)

0-? 0-? ?-100 ?-100

cI2 hP4 cI2 cF4

Im3m P63/mmc Im3m Fm3m

A2 A3¢ A2 A1

W aLa W Cu

Weight Percent Ytterbium 0

10

20

30

50

40

60

70

80

90

100

1400

L1

L2

1200

L1 + L2

Temperature, °C

1000 931°C

(βPr)

800 795°C

819°C 795°C

(γYb) (αPr)

600

(βYb) 400

200

0

0

Pr

10

20

30

40

50

60

70

80

90

Atomic Percent Ytterbium

Fig. 1 Pr-Yb phase diagram

386

Journal of Phase Equilibria and Diffusion Vol. 29 No. 4 2008

100

Yb