Fig. 2

Structure characterizations of as-prepared high entropy Cs₃{TbDyHoErTm}₁Cl₆. a Representative photograph of large-scale synthetic crystals of Cs₃TbCl₆ under 365 nm UV light irradiation. b Schematic diagram of the reversible synthesis of Cs₃TbCl₆ crystals. c The schematic illustration of high-entropy Cs₃{TbDyHoErTm}₁Cl₆ crystals. The (d) HRTEM image and (e) SEM elemental mappings of high-entropy Cs₃{TbDyHoErTm}₁Cl₆ crystals. f The general XRD and fine scans over the (\(\bar{1}\)13) reflection of high entropy Cs₃{TbDyHoErTm}₁Cl₆ crystals and the related physical mixture of Cs₃TbCl₆, Cs₃DyCl₆, Cs₃HoCl₆, Cs₃ErCl₆, and Cs₃TmCl₆