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Powder XRD patterns. (a) and (b) . Inset: satellite reflection peaks around the 111 peak due to the superlattice structure of the self-assembled 2D vacancy planes at the (111) plane can be observed.
Temperature dependence of the thermal conductivity of and . Balls and lines represent the measured and minimum values, respectively. Orange and violet symbols represent the results for and , respectively.
A high-resolution TEM image and electron diffraction pattern taken from a single grain of the sintered pellet of obtained with the electron beam aligned along the  direction. (a), Zinc-blende nanostructured domains are surrounded by self-assembled 2D vacancy planes. These vacancy planes appear at the (111) plane at approximately 3.5 nm intervals. (b) and (c), Superlattice spots exist at the positions between two neighboring fundamental spots along the  direction.
Temperature dependence of the Seebeck coefficient (: green), electrical conductivity (: wine color), and dimensionless figure of merit (: blue) of .
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