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Dislocations have been considered to be an efficient source for scattering midfrequency phonons, contributing to the enhancement of thermoelectric performance. The structure of dislocations can be resolved by electron microscopy whereas their chemical composition and decoration state are scarcely known. Here, we correlate transmission Kikuchi diffraction and (scanning) transmission electron microscopy in conjunction with atom probe tomography to investigate the local structure and chemical composition of dislocations in a thermoelectric Ag-doped PbTe compound. Our investigations indicate that Ag atoms segregate to dislocations with a 10-fold excess of Ag compared with its average concentration in the matrix. Yet the Ag concentration along the dislocation line is not constant but fluctuates from ∼0.8 to ∼10 atom % with a period of about 5 nm. Thermal conductivity is evaluated applying laser flash analysis …
American Chemical Society
Publication date: 
31 Jan 2018

Yuan Yu, Siyuan Zhang, Antonio Massimiliano Mio, Baptiste Gault, Ariel Sheskin, Christina Scheu, Dierk Raabe, Fangqiu Zu, Matthias Wuttig, Yaron Amouyal, Oana Cojocaru-Mirédin

Biblio References: 
Volume: 10 Issue: 4 Pages: 3609-3615
ACS applied materials & interfaces