Interaction in the system based on the Cs₃Sb₂Br₉(I₉) and Cs₂TeBr₆(I₆) compounds

Chem. Met. Alloys 10 (2017) 113-119

https://doi.org/10.30970/cma10.0365

Ivanna Stercho, Artem Pogodin, Oleksandr KoKhan, Igor Barchiy, Anatolii Fedorchuk, Iwan Kityk, Michal Piasecki

The physico-chemical interactions in the system based on the compounds Cs₃Sb₂Br₉, Cs₃Sb₂I₉, Cs₂TeBr₆, and Cs₂TeI₆ were investigated by DTA, XRD and MSA, in combination with mathematical modeling. Due to the formation of an unlimited solid solution in the Cs₂TeBr₆–Cs₂TeI₆ system, the investigated multicomponent system is presented as the Cs₃Sb₂Br₉–Cs₃Sb₂I₉–Cs₂TeBr_6–хIх quasiternary system. The projection of the liquidus surface and an isothermal section (573 K) were constructed. The Cs₃Sb₂Br₉–Cs₃Sb₂I₉–Cs₂TeBr_6–хIх system is of the invariant eutectic type. The crystal structures of the Cs₃Sb₂Br₉(I₉) and Cs₂TeBr₆(I₆) ternary compounds were determined and compared with related B-deficient perovskite structures.

Liquidus surface projection of the Cs₃Sb₂Br₉–Cs₃Sb₂I₉–Cs₂TeBr_6–хIх system.

Keywords

Halide perovskite / Phase equilibria / Solid solution / Liquidus projection / Crystal structure