Synthesis of a series of rare-earth-based multi-anion chalcogenide iodides RE 3 Si 2 Se x S 8− x I (RE = La, Ce, Pr, and Nd) using the flux-assisted boron–chalcogen mixture method

Single crystals of rare-earth-based multi-anion chalcogenide iodides RE 3 Si 2 Se x S 8− x I were synthesized via a reactive flux-assisted Boron Chalcogen Mixture method. All structures crystallize in the La 3 Si 2 O 8 Cl structure type. Selenium incorporation improves optical properties.