Reconstructing Nearly Isotropic Microstructures to Construct One-dimensional Framework Causing the Record Birefringence in Thiophosphates

Novel birefringent materials, α-Rb 2 InP 2 S 7 , β-Rb 2 InP 2 S 7 , and Cs 2 InP 2 S 7 were reconstructed from the nearly isotropic basic building units and displayed the largest birefringence among all known thiophosphates.