Anomalies in the structure and properties of titanium diselenide intercalated by iron

The transition between the heavy and localized polaron modes in the FexTiSe2 compounds used as an example is studied by methods of thermal analysis, neutron diffraction, and do conductivity. It is found that the transition under investigation is accompanied by an anomaly in the behavior of the crystallographic parameters. The changes observed in the character and magnitude of the electrical conductivity at a higher temperature. as well as the thermal effect, are attributed to thermal broadening of the polaron band. The difference between the data for FexTiSe2 and the previously obtained results for AgxTiTe2 correlates with the difference in the binding energies of the polaron bands in these materials.