Study of the Physicochemical Properties of the TlInTe2–Fe System

The alloys of the TlInTe2–Fe system were studied by differential thermal analysis, X-ray diffraction, and microstructural analysis. The solubility range of iron in the TlInTe2 compound was determined to be 5.0 at % at 296 K. Solid solutions formed on the basis of the ternary compound TlInTe2 in the TlInTe2–Fe system are predominantly interstitial solid solutions, with iron atoms located mainly in the octahedral voids along the c axis between thallium ions. The appearance of a new mode at ~120 cm–1 in the Raman scattering spectra of single-crystal TlInTe2 samples doped with 5.0 at % Fe was observed. It was found that the incorporation of iron atoms into the TlInTe2 crystal lattice lowers the activation energy of impurity conductivity and increases the crystal’s conductivity due to the rise in charge carrier concentration.