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

Table 6

Static optical properties for GeFeS₃: dielectric constants and , static refractive index , and static reflectivity for all directions.

Phase	Direction
221-Pm-3m		65.60	13.6	8.10	0.61
127-P4/mbm		30.10	5.80	5.50	0.48
		31.20	6.90	5.60	0.49
62-Pnma		60.50	13.9	7.80	0.60
		36.0	5.50	6.10	0.51
		79.50	26.10	9.10	0.65