5c , the refractive indices of the investigated compounds exhibit an increasing trend from zero photon energy (0 eV) up to their respective maximum values of 1.87 (5.04 eV) for K 2 TlAsF 6 , 2.25 (3.08 eV) for K 2 TlAsCl 6 , 2.62 (2.32 eV) for K 2 TlAsBr 6 , and 3.24 (1.78 eV) for K 2 TlAsI 6 as compared to the highest peak observed at 3.38 eV for K 2 TlAsCl 6 and 2.79 eV for K 2 TlAsBr 6 , respectively. 19 Following the attainment of its peak value, the refractive index for each compound exhibits a decline across specific energy intervals.
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Determination of the light matter interaction and thermal heat conversion efficiency of K<sub>2</sub>TlAsZ<sub>6</sub> (Z = F, Cl, Br, and I) using a DFT approach.
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