Ba3(BS3)(PS4): the first alkaline-earth metal thioborate–thiophosphate with strong optical anisotropy originating from planar [BS3] units†
Abstract
The first alkaline-earth metal thioborate–thiophosphate Ba3(BS3)(PS4) was designed from Ba3(BO3)(PO4) by S–O substitution and fabricated experimentally. The [BS3] pseudo-layers formed in the structure contribute to the strong optical anisotropy and a large birefringence of ∼0.11 at 1064 nm. The results enrich the structural and chemical diversity of chalcogenides.