Abstract
The phase diagrams of the La-Ru and Nd-Ru systems have been investigated using differential thermal analysis, metallographic analysis, X-ray diffraction and electron microscopy. The ruthenium-rich side (80–100 at.% Ru) has not been studied owing to the high melting temperatures. The compounds R 3Ru (Fe 3C type), R 5Ru 2 (Mn 5C 2 type) and RRu 2 (MgCu 2 type) have been confirmed. Two new intermediate phases have been found: R 7Ru 3 which crystallizes with the Sr 7Pt 3 type and RRu x , at about 38 at.% Ru, the structure of which should be related to the Y 44Ru 25 type. None of these phases show appreciable ranges of solid solubility. Additions of ruthenium to lanthanum and neodymium do not significantly affect their transition temperatures. The two phase diagrams appear to be nearly the same.
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