The Ce-Mg-Y system

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 degrees C, revealing the existence of two novel ternary compounds: Ce1-xYxMg5-y (0.39 less than or equal to x less than or equal to 0.84; 0 less than or equal to y less than or equal to 0.60) with the GdMg5, or the defect Sm11Cd45-type and the cubic Laves phase Ce1-xYxMg2 (x approximate to 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 delta phase with the alpha Sm-type has been shown to be metastable.