Coupled Insights into Structural, Electronic, and Optical Properties of GeTMS₃(TM=Sc, Fe, Zn) Sulfide Perovskite across Different Phases: Ab Initio Study

Table 5

Static optical properties for GeScS₃: dielectric constants and , static refractive index , and static reflectivity for all directions.

Phase	Direction
221-Pm-3m		21.2	7.70	12.5	0.42
127-P4/mbm		15.0	1.90	3.90	0.35
		11.0	0.20	3.30	0.29
62-Pnma		26.9	6.80	5.20	0.47
		24.8	5.30	5.0	0.45
		27.40	6.40	5.3	0.47