Abstract
The phase diagram of the La—Rh system (0–70 at.% Rh) was investigated using differential thermal analysis, micrographic analysis, X-ray diffraction and electron microscopy. Eight compounds are formed in this system, one of which was not previously known (La 3Rh 2). The existence of most of the compounds reported earlier has been confirmed, except two compounds which have to be deleted (La 3Rh and La 5Rh 3). The shape of the diagram is markedly different from that reported in the current literature and shows in the 30–70 at.% Rh range melting points lower by about 100–150 °C. The rhodium-rich side of the diagram has not been investigated owing to the high melting points of the corresponding alloys.
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