Abstract
A partial phase diagram for the ThCd system was established using chemical analysis, electron probe microanalysis (EPM), differential thermal analysis and X-ray diffraction (XRD) techniques. The solubility of thorium in cadmium can be represented by the equations log(wt.%Th) = 7.349 − 5458T −1 in the range 599–841 K and log(wt.%Th) = 7.705 − 10142T −1 + 3.688 × 10 6T −2 in the range 841 − 1021 K. The most cadmium-rich phase, ThCd 11, decomposes peritectically at 568 °C into ThCd 5 plus saturated liquid. Phases previously suggested to be ThCd 11, ThCd 5 and ThCd 2 were confirmed by EPM and a new phase, ThCd 3, was identified by EPM and XRD (hexagonal, a = 6.775 A ̊ and c = 4.928 A ̊ ).
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