Pb2(SeO3)(SiF6): the first selenite fluorosilicate with a wide bandgap and large birefringence achieved through perfluorinated group modification

The first selenite fluorosilicate, Pb 2 (SeO 3 )(SiF 6 ), modified with perfluorinated groups, features a broad transparency range, large birefringence, high LIDT, and excellent environmental stability, marking it a potential birefringent material.