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: ThTl3 (AuCu3 type), Th3Tl5 (Pu3Pd5 type), ThTl (ThIn type), Th5Tl3 (Mn5Si3 type) and Th2Tl (CuAl2 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.
THE TH-TL PHASE-DIAGRAM AND THE ALLOYING PROPERTIES OF THORIUM WITH THE GROUP IIIB ELEMENTS
CANEPA, FABIO MICHELE
1985-01-01
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: ThTl3 (AuCu3 type), Th3Tl5 (Pu3Pd5 type), ThTl (ThIn type), Th5Tl3 (Mn5Si3 type) and Th2Tl (CuAl2 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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