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ection III: Supplemental Literature Review

Bi-Ti (Bismuth-Titanium) H. Okamoto

The Bi-Ti phase diagram in [Massalski2] was redrawn from [1994Mur]. Only two phases, BiTi2 and BiTi3, were known to exist in this system. [1997Ric] found a new compound Bi9Ti8 and determined its crystal structure. [2006Vas] discovered three new phases Bi2Ti, Bi3Ti2, and BiTi by means of diffusion couple experiments. [2006Vas] thinks that this

Table 1

BiTi is associated with Bi9Ti8 found by [1997Ric]. Figure 1 shows the Bi-Ti phase diagram proposed by [2006Vas] with modification from BiTi to Bi9Ti8. The liquidus curve is tentative in the entire composition range. Table 1 shows Bi-Ti crystal structure data according to [1994Mur] and [1997Ric].

Bi-Ti crystal structure data

Phase

Composition, at.% Ti

Pearson symbol

Space group

Struktur-bericht designation

Prototype

(Bi) Bi2Ti Bi3Ti2 Bi9Ti8 BiTi2 BiTi3 (bTi) (aTi)

0 33.3 40 47.1 66.7 75 90-100 98.5-100

hR2 ÆÆÆ ÆÆÆ tP34 tP12 t** cI2 hP2

 R3m ÆÆÆ ÆÆÆ P4/nmm P42/mmc ÆÆÆ Im3m P63/mmc

A7 ÆÆÆ ÆÆÆ ÆÆÆ ÆÆÆ ÆÆÆ A2 A3

aAs ÆÆÆ ÆÆÆ ÆÆÆ ÆÆÆ ÆÆÆ W Mg

Weight Percent Titanium 0

10

20

30

40

50

60 70

80 90 100

1800 1670°C 1600

L 1400

1340°C 1287°C

Temperature, °C

1200

(β Ti) 997°C

1000

882°C

817°C 800

725°C

687°C

BiTi3

BiTi2

Bi9Ti8

400

Bi3Ti2

Bi2Ti

600

(α Ti)

217°C

271.442°C 200

(Bi) 0 0

Bi

10

20

30

40

50

60

70

80

90

Atomic Percent Titanium

Fig. 1 Bi-Ti phase diagram

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Journal of Phase Equilibria and Diffusion Vol. 31 No. 3 2010

100

Ti

Supplemental Literature Review: Section III References 1994Mur: J.L. Murray, The Bi-Ti (Bismuth-Titanium) System, Bull. Alloy Phase Diagrams., 1994, 5(6), p 610-613

1997Ric: C.G. Richter and W. Jeitschko, Preparation and Crystal Structure of the Titanium and Hafnium Bismuthides Ti8Bi9 and Hf8Bi9, J. Solid State Chem., 1997, 134, p 26-30 2006Vas: G.P. Vassilev, Contribution to the Ti-Bi Phase Diagram, Cryst. Res. Technol., 2006, 41(4), p 349-357

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