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Supplemental Literature Review: Section III

Ni-Tb (Nickel-Terbium) H. Okamoto

The Ni-Tb phase diagram was not included in [Massalski2] due to lack of data. Two Ni-Tb phase diagrams were reported in 2004, first by [2004Ron] (Fig. 1) and then by [2004Yao] (Fig. 2). The

Table 1

data points in Fig. 1 were obtained by differential thermal analysis (DTA) and electromotive force (EMF) measurements, and the phase boundaries were determined by thermodynamic optimization. The data points in Fig. 2 were

Ni-Tb Crystal structure data [Massalski2] Composition, at.% Tb

Pearson symbol

Space group

Strukturbericht designation

Prototype

(Ni) Ni17Tb2 Ni5Tb Ni7Tb2

0 10.5 16.7 22.2

Ni3Tb Ni2Tb NiTb

25 33.3 50

cF4 hP38 hP6 hR54 hP36 hR24 cF24 oP24 mP24 oC8 mC20 oP16 cI2 hP2

Fm3m P63/mmc P6/mmc R3m P63/mmc R3m Fd3m Pnma P21/m Cmcm C2/m Pnma Im3m P63/mmc

A1 … D2d … … … C15 … … Bf … D011 A2 A3

Cu Th2Ni17 CaCu5 Gd2Co7 Ce2Ni7 PuNi3 Cu2Mg … … CrB Dy3Ni2 Fe3C W Mg

Phase

Ni2Tb3 NiTb3 (␤Tb) (␣Tb)

60 75 100 100

Fig. 1 Ni-Tb phase diagram reported by [2004Ron]

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Section III: Supplemental Literature Review

Fig. 2 Ni-Tb phase diagram reported by [2004Yao]

Fig. 3 Comparison of Fig. 1 and 2

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Journal of Phase Equilibria and Diffusion Vol. 26 No. 3 2005

Supplemental Literature Review: Section III obtained by DTA. In Fig. 2, the peritectic formation temperatures of Ni17Tb2 and Ni7Tb2 are both labeled 1284 °C, but on the outside temperature scale they appear as ∼1304 °C . These two phase diagrams are compared in Fig. 3. General trends are in good agreement, but a substantial (>100 °C) difference is observed in the peritectic formation temperature of Ni2Tb3. Table 1 shows Ni-Tb crystal structure data given in [Massalski2].

References 2004Ron: Q. Rong and H.J. Schaller, On the Constitution and Thermodynamics of Ni-Tb Alloys, J. Alloys Compd., Vol 365, 2004, p 188-196 2004Yao: Q. Yao, H. Zhou, and Y. Wang, Tb-Ni Binary Alloy Phase Diagram, The 12th National Symposium on Phase Diagram, Materials, Design, and Their Applications, China, 2004, p 177-179 (in Chinese)

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