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The X-ray diffraction (XRD) pattern of TlInTe2 in powder form at room tem- perature is shown in Fig. 2. As observed, the powder XRD pattern has revealed a polycrystalline nature of the investigated sample. The data analysis of the structure was indexed using (JCPDS card; number 71−2195). The analysis matches with tetrag- onal structure with lattice parameters a = 8.494, b = 8.494, and c = 7.181 which is in accordance with K. Wakita et al.17. The highest preferred orientation is found along the (202) plane. The crystallite size D of the bulk TlInTe2 was calculated according to the following equation: $$D=\frac{{K\lambda }}{{\beta \cos \theta }}$$ (1) where K is the shape factor which equals 0.95, λ is the wavelength of Cu (Kα) radi- ation, β is the experimental observed peak width at half maximum height (FWHM), and θ is Bragg’s angle. The dislocation density δ was determined by the following equation: $$\delta =\frac{1}{{{D^2}}}$$ (2) The microstrain ε developed in the prepared TlInTe2 pellet was calculated by using the following relation: $$\varepsilon =\frac{{\beta \cot \theta }}{4}$$ (3) The structural parameters of TlInTe2 are listed in Table 1. Optical properties of TlInTe2 Transmission measurements were used to determine the absorption coefficient...

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