Abstract
The cerium-gallium system has been investigated by differential thermal analysis (DTA), metallography, X-ray diffraction and electron microprobe analysis. The following intermediate phases were observed: Ce 3Ga 2 (decomposes at 850 °C), CeGa (decomposes at 960 °C) and CeGa 2 (melting point 1444 °C). Two eutectic reactions occur: Ce-Ce 3Ga 2 (495 ± 3 ° C) and one on the gallium-rich side at about 30 °C. The addition of gallium to cerium affects the δ(b.c.c.) to γ(f.c.c.) transition temperature of cerium, lowering it from 725 °C to 703 °C. The structure of Ce 3Ga 2 was identified as the tetragonal Zr 3Al 2 type with the following lattice parameters: a = 8.3 A ̊ , c = 7.64 A ̊ .
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