Cr-Ga (Chromium-Gallium)
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Supplemental Literature Review: Section III
Cr-Ga (Chromium-Gallium) H. Okamoto
The Cr-Ga phase diagram in [Massalski2] was redrawn from [1972Bor] (dashed lines in Fig. 1). [1999Gro] assessed the Cr-Ga system thermodynamically, but [2005Bel] noticed that the result was in disagreement with the experimental phase diagram of [1972Bor] particularly in the Cr-rich end. Therefore, [2005Bel] measured the enthalpies of formation for Cr3Ga and CrGa4, and reassessed the Cr-Ga system. The result is shown with solid lines in Fig. 1. The agreement between [1972Bor] and [2005Bel] is good except around the melting point of Cr. An unusual feature in this phase diagram is that Cr3Ga and Cr4Ga are off-stoichiometric. In particular, it is unlikely that the magnitude of the off-stoichiometry is the same for the two modifications of Cr3Ga, as shown in Fig. 1. Because off-stoichiometric line compounds are not so common in all
binary systems in [Massalski2], the Cr-Ga phase diagram may need further confirmation.
References 1972Bor: J.D. Bornand and P. Feschotte, The Binary ChromiumGallium System, J. Less Common Met., 1972, 29, p 81-91 in French 1999Gro: J. Gro¨bner, R. Wenzel, G.G. Fischer, and R. SchmidFetzer, Thermodynamic Calculation of the Binary Systems MGa and Investigation of Ternary M-Ga-N Phase Equilibria (M = Ni, Co, Pd, Cr), J. Phase Equilib., 1999, 20(6), p 615-625 2005Bel: A. Belgacem-Bouzida, Y. Djaballah, and M. Notin, Calorimetric Measurement of the Intermetallic Compounds Cr3Ga and CrGa4 and Thermodynamic Assessment of the (Cr-Ga) System, J. Alloys Compds, 2005, 397, p 155-160
Fig. 1 Cr-Ga phase diagram
Journal of Phase Equilibria and Diffusion Vol. 28 No. 3 2007
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