Information on real-structure phenomena in metastable GeTe-rich germanium antimony tellurides (GeTe)_nSb₂Te₃ (n ≥ 3) by semi-quantitative analysis of diffuse X-ray scattering

Abstract

Quenching cubic high-temperature polymorphs of (GeTe)

Heterostructures of skutterudites and germanium antimony tellurides – structure analysis and thermoelectric properties of bulk samples

“…This twinning is typical for germanium antimony tellurides and was found to play an important role in their phase transition behavior by inducing stress and strain, especially in small crystallites. 34,35…”

Structural Complexity and Thermoelectric Properties of Quaternary and Quinary Tellurides (GexSn1–x)0.8(InySb1–y)0.13Te with 0 ≤ x,y ≤ 1

“…Pronounced layer‐like defect ordering and a tendency towards superstructures becomes evident with increasing vacancy concentrations as illustrated for Ge 0.35 Sn 0.35 In 0.1 Sb 0.1 Te and more clearly on Ge 0.286 Sn 0.286 In 0.143 Sb 0.143 Te by selected area electron diffraction (SAED) and high resolution transmission electron microscopy (HRTEM). “Comet‐like” diffuse streaks observed in SAED patterns and Fourier transforms of HRTEM micrographs (Figure S8, Supporting Information) of quenched Ge 0.35 Sn 0.35 In 0.1 Sb 0.1 Te can be explained by a pseudocubic domain structure with a non equidistant arrangement of finite vacancy layers . HRTEM images of quenched Ge 0.286 Sn 0.286 In 0.143 Sb 0.143 Te reveal some layered domains (size < 100 nm) with vacancy ordering (Figure ).…”

Cobalt germanide precipitates indirectly improve the properties of thermoelectric germanium antimony tellurides

“…4) are caused by vacancy diffusion and element ordering during heating and cooling as reported in the literature. [75][76][77]…”

“…After a first heating step to 500 1C, which eliminates metastable states, especially concerning the vacancy distribution, [75][76][77] all transport properties of heterostructured GST and GeTe samples correspond to distorted variants of rhombohedral a-GeTe type. The GST sample with n = 12, however, exhibits pseudocubic metrics (anisotropic peak broadening indicates a very small rhombohedral distortion).…”