Abstract
The domain structure of the thermoelectric compound (AgSbTe2)15(GeTe)85 was analyzed using high resolution transmission electron microscopy. Numerous coherent domain boundaries of two different types were observed, formed by the polar phase transition from the cubic NaCl-type phase to a rhombohedral structure with an angular distortion of 0.5–1.5°. One type has twin boundaries parallel to [001] and [110] directions, the other has inversion domain boundaries parallel to [111] and [112] directions. This high density of internal interfaces could reduce lattice thermal conductivity due to phonon scattering on the interfaces, and less deleterious on electronic transport processes, because they are coherent.
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