Abstract
An investigation on Bi-Th alloys was performed using X-ray and metallographic analyses and measurements of the heats of formation. The crystal structures of Th 3Bi 4 (c128, Th 3P 4 type) and ThBi 2(tP6, Cu 2Sb type) were confirmed; moreover two phases with an hP16, Mn 5Si 3-type structure and a cP2, CsCl-type structure respectively were observed. The ΔH of formation of Th-Bi alloys was measured using a direct isoperibol calorimeter. The following values were obtained for the various compounds (reaction in the solid state at 300 K): Th 5Bi 3, −15.9 ± 0.5 kcal (g atom) 1; ThBi, −19.4 ± 0.5 kcal (g atom) 1; Th 3Bi 4, −20.4 ± 0.5 kcal (g atom) 1; ThBi 2, −16.5 ± 0.5 kcal (g atom) 1. The data available (both the results obtained in this work and those already known) are discussed briefly and related to a possible shape of the phase diagram.
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