Fig. 4: Microstructure of Pb0.935Cd0.04Na0.025Se0.5S0.25Te0.25 sample.
From: Entropy engineering promotes thermoelectric performance in p-type chalcogenides
a Medium magnification STEM image shows the coexistence of nanoprecipitates and mesoscopic precipitates. Electron diffraction spots along b (001) and c (110) orientations. The green and red arrows represent spots from PbSe and CdS structures, respectively. d, e HAADF images of two typical nanoprecipitates that contain high-density stacking faults. The insets are the GPA results along the xy directions. f The enlarged image of the selected area in e image. The GPA result shows the tense lattice strains around the stacking faults. g Calculated surface energy (γ) of PbSe/CdS and PbSe0.5S0.25Te0.25/CdS interfaces. h Calculated deformation energy of rock salt CdS phase in PbSe and PbSe0.5S0.25Te0.25 lattice. The crystal structures in g and h represent the calculation model.
