ChemInform Abstract: The Crystal Structure of Synthetic Stuetzite, Ag5‐xTe3.

Abstract

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Promising Thermoelectric Ag5−δTe3 with Intrinsic Low Lattice Thermal Conductivity

“…The room-temperature X-ray diffraction (XRD) patterns of Ag 5−δ Te 3 (−0.04 ≤ δ ≤ 0.14) obtained in this work are shown in Figure2a. The majority of peaks can be well-indexed to the corresponding hexagonal structure,52 while impurity peaks of Ag 2 Te can be observed in all samples (indicated by down triangles). To further identify the second phase and confirm the homogeneity of the matrix phase, scanning electron microscopy (SEM) observations and the energy-dispersive spectrometry (EDS) composition mapping are carried out at room temperature (Figure2c−h).…”

“…Ag 5−δ Te 3 is rich in phase transition (Figure S1) 39,50,51 and possesses an interesting ionic conduction as well. 52 At room temperature and above, its structure involves cation disordering to enable highly mobile Ag cations distributed in a tellurium framework, 52−55 indicating weakly bonded Ag atoms for a low sound velocity. This inspires us to expect a low lattice thermal conductivity and therefore a high zT in Ag 5−δ Te 3 .…”

“…Figure 1. Crystal structure of hexagonal Ag 5−δ Te 3 at room temperature (a) and the projection along [001] (b).The white portion of the atoms indicates the probability to be vacant at the corresponding site 52. …”