Copper Chalcogenide-Copper Tetrahedrite Composites-A New Concept for Stable Thermoelectric Materials Based on the Chalcogenide System.

ABSTRACT: For the first time, an alternative way of improving the stability of Cu-based thermoelectric materials is proposed, with the investigation of two different copper chalcogenide-copper tetrahedrite composites, rich in sulfur and selenium anions, respectively. Based on the preliminary DFT results, which indicate the instability of Sb-doped copper chalcogenide, the Cu1.97S-Cu12Sb4S13 and Cu2-xSe-Cu3SbSe3 composites are obtained using melt-solidification techniques, with the tetrahedrite phase concentration varying from 1 to 10 wt.%. Room temperature structural analysis (XRD, SEM) indicates the two-phase structure of the materials, with ternary phase precipitates embed within the copper chalcogenide matrix. The proposed solution allows for successful blocking of excessive Cu migration, with sta

SUBMITTER: Mikula A 

PROVIDER: S-EPMC8157852 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature