Untersuchungen zum Zustandsdiagramm EuCl2–EuCl3

Investigations on the Phase Diagram EuCl₂–EuCl₃ The phase diagram EuCl₂–EuCl₃ was determined by difference‐thermoanalysis and the barogram of the system was determined by total pressure measurements of different compositions in function of temperature. By the results the phase diagram was precised. Eu₅Cl₁₁ decomposes at 565 °C in to EuCl_2,s and Eu₄Cl_9,s and shows a transition at 510 °C. Eu₄Cl₉ decomposes at 603 °C in to EuCl_2,s and Eu₁₄Cl_33,s. Eu₁₄Cl₃₃ decomposes at 612 °C peritectically in EuCl_2,s and a EuCl₃‐rich melt. Eu₁₄Cl₃₃ shows two high temperature transition points at 570 °C and 580 °C. The endothermal effect of compositions near Eu₁₄Cl₃₃ was interpreted as an endothermal formation of this compound. The eutectikum was detected between Eu₁₄Cl₃₃ and EuCl₃ to 60 ± 1 Mol‐% EuCl₃ at 530 °C.