Matkivskyi O. Physical and chemical properties of thermoelectric nanocomposites based on compounds IV-VI.

A promising way of optimizing the plumbum telluride (PbTe) properties is producing nanocomposite structures. This research describes a complex of physical and chemical properties of composite thermoelectric materials consisting of microdispersed plumbum telluride and nanodispersed mixtures of ZnO, TiO2, SiO2, Ag and microdispersed CdTe. Also this research includes nanocomposite structure descriptions and dependencies between temperature and thermoelectric parameters (specific conductance, Zeebeck coefficient, thermal conductivity) for them.Research states that under (473-523) К clear lead telluride and its nanocomposites have electro physical properties of p-type semiconducting in near surface layer while in higher temperatures its own conductivity grows. Kinetic properties of charge carriers in composite samples, produced by pressing powder, are caused by acoustic phonon scattering and thermionic emission of charge carriers on grain boundaries. Nanocomposites PbTe/ZnO, PbTe/TiO2, PbTe/Ag gave evidence of active interactions between of base and impurity materials. Atoms of impurity materials diffuse deeply into basic material influencing its properties. Silicon dioxide and cadmium telluride are less electrically active additives, and provide the possibility of more independent modification of the electro physical and thermo physical properties of the material.