Abstract
On the basis of a critical assessment, the Ce-Mg-Y system has been investigated, employing X-ray diffraction (XRD), optical microscopy, and microprobe analyses. Phase relations have been determined in the complete isothermal section at 500 °C, revealing the existence of two novel ternary compounds: Ce1−xYxMg5−y (0.39 ≤ x ≤ 0.84; 0 ≤ y ≤ 0.60) with the GdMg5, or the defect Sm11Cd45-type and the cubic Laves phase Ce1−xYxMg2 (x ≈ 0.67). The binary system Ce-Y has been reinvestigated, and a constitutional diagram, temperature vs concentration, has been proposed. In contrast to earlier versions, the so-called δ phase with the αSm-type has been shown to be metastable.
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