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Section III: Supplemental Literature Review

Bi-Rh (Bismuth-Rhodium) H. Okamoto

The Bi-Rh phase diagram in [Massalski2] was redrawn from [Elliott]. [2009Wei] reinvestigated the Bi-rich part of this system by applying high-temperature centrifugation, DTA/DSC measurements, and x-ray diffraction analysis. Figure 1 shows the Bi-Rh phase diagram determined by [2009Wei] except the region involving the BiRh phase. Because the peritectic formation of BiRh in Fig. 1 was out of the range in the [2009Wei] diagram, it was adopted from [Elliott]. Bi2Rh was shown to exist in three polymorphic forms in [Massalski2]. However, [2009Wei] found only two forms. Bi-Rh crystal structure data are shown in Table 1.

Table 1

In addition to the phases shown in Fig. 1, [2009Wei] found a metastable phase Bi14Rh3 (17.6 at.% Rh).

References 2009Wei: F. Weitzer, W. Schnelle, R.C. Gil, S. Hoffmann, R. Giedigkeit, and Y. Grin, Phase Relationship and Superconductivity in the Bi-Rich Part of the Binary System Rh-Bi, Calphad, 2009, 33, p 27-30

Bi-Rh crystal structure data

Phase

Composition, at.% Rh

Pearson symbol

Space group

Strukturbericht designation

Prototype

(Bi) Bi4Rh Bi3Rh bBi2Rh aBi2Rh BiRh

0 20 25 33.3 33.3 45-