Abstract
The phase diagram of the Th-Tl system has been examined over almost the whole composition range using differential thermal analysis (DTA) and X-ray analysis. Five intermediate phases have been found to exist: ThTl 3 (AuCu 3 type), Th 3Tl 5 (Pu 3Pd 5 type), ThTl (ThIn type), Th 5Tl 3 (Mn 5Si 3 type) and Th 2Tl (CuAl 2 type). Three eutectic points are also present in this system: 22.0 at.% Tl and 1080 °C; 60.5 at.% Tl and 1180 °C; less than 1.0 at.% Th and 295 °C. The thorium-rich region of the diagram, up to 20 at.% Tl, has not been examined owing to the strong contamination of the alloys by the container material (molybdenum) and has been drawn on the basis of dimensional considerations and some DTA results. The data obtained have been used to complete a general view of the alloying properties of thorium with the group IIIB elements.
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