This study concerns structural and optothermal properties of iron ditelluride layered structures which were fabricated via a low-cost protocol. The main precursors were FeCl3· 6H2O and Fe2O3. After a heat treatment within a tellurium-rich medium at various temperatures (470°C, 500°C, and 530°C) during 24 h, classical analyses have been applied to the iron ditelluride layered structures. A good crystalline state with a preferential orientation of the crystallites along (111) direction has been recorded. Moreover, additional opto-thermal investigation and analyses within the framework of the Lattice Compatibility Theory gave plausible explanation for prompt temperature-dependent incorporation of tellurium element inside hematite elaborated matrices.
In 2 S 3 À x Se x and (In 2 S 3 ) x (In 2 O 3 ) y thin films have been prepared on glass substrates using appropriate heat treatments of In evaporated thin films. X-ray analysis shows that In thin films which were annealed under sulfur atmosphere at 350 1C were mainly formed by In 2 S 3 . A heat treatment of this binary in air at 400 1C during one hour leads to (In 2 S 3 ) x (In 2 O 3 ) y ternary material which has a tetragonal structure with a preferred orientation of the crystallites along the (109) direction. Similarly, a heat treatment of In 2 S 3 in selenium atmosphere at 350 1C during six hours leads to a new In 2 S 3 À x Se x ternary material having tetragonal body centered structure with a preferred orientation of the crystallites along the (109) direction. Optical band gap, refractive index and extinction coefficient values of In 2 S 3 À x Se x and (In 2 S 3 ) x (In 2 O 3 ) y thin films have been reached. Moreover, correlations between optical conductivity, XRD, AFM and Urbach energy of such ternary thin films have been discussed. Finally, the recorded formation disparity between the quaternary (In 2 S 3 ) x (In 2 O 3 ) y and ternary In 2 S 3 À x Se x compounds has been discussed in terms of the Simha-Somcynsky and Lattice Compatibility theories.
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