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Section III: Supplemental Literature Review

Hf-I (Hafnium-Iodine) H. Okamoto

The Hf-I phase diagram was unknown in [Massalski2]. Figure 1 shows a partial Hf-I phase diagram reported by [1969Str]. The phase boundaries were determined by measuring the compositions of equilibrated samples. HfI3 is in equilibrium with (aHf) [1969Str]. Hf-I crystal structure data given in Table 1 were adopted from [2007Vil].

Table 1

References 1969Str: A.W. Struss and J.D. Corbett, The Lower Halides of Hafnium. A Nonstoichiometric Hafnium Triiodide Phase, Inorg. Chem., 1969, 8(2), p 227-232 2007Vil: P. Villars and K. Cenzual, Pearson’s Crystal Data CD-ROM, ASM International, OH, 2007

Hf-I crystal structure data

Phase

Composition, at.% I

Pearson symbol

Space group

Strukturbericht designation

Prototype

(bHf) (aHf) HfI3 HfI4 (I)

0 0 75 to ? 80 100

cI2 hP2 hP8 mC40 oC8

Im3m P63/mmc P63/mcm C12/c1 Cmca

A2 A3 ÆÆÆ ÆÆÆ A14

W Mg ÆÆÆ ÆÆÆ I

Only HfI3 is shown in Fig. 1

Fig. 1 Hf-I phase diagram

490

Journal of Phase Equilibria and Diffusion Vol. 31 No. 5 2010