层状金碲化物 AuSbTe 和 Au$_2$Te$_3$ 的合成及其半导体与金属行为
Synthesis of layered gold tellurides AuSbTe and Au$_2$Te$_3$ and their semiconducting and metallic behavior
AI总结：
本研究探讨了层状金碲化物 AuSbTe 和 montbrayite 的合成、热稳定性及电子特性，发现前者为非同熔半导体，后者为同熔金属，并确定了二者的有效合成方法及单晶合成挑战。
摘要：
先前对 pampaloite (AuSbTe) 天然样品的研究揭示了一种可能具有可解理和/或可剥离特性的材料的晶体结构，而对天然和合成 montbrayite (含 Sb 的 Au$_2$Te$_3$) 的研究则声称这种低对称性化合物具有多种化学成分。这两种材料的合成样品研究鲜有报道，导致其大部分化学、热学和电子特性仍不为人知。在此，我们研究了金锑碲化物 AuSbTe 和 Au$_{1.9}$Sb$_{0.46}$Te$_{2.64}$ (montbrayite) 的稳定性、电子特性和合成。差热分析和原位粉末 X 射线衍射表明，AuSbTe 为非同熔，而 Au$_{1.9}$Sb$_{0.46}$Te$_{2.64}$ 为同熔。能带结构计算和四点电阻率测量显示，AuSbTe 是半导体，而 Au$_{1.9}$Sb$_{0.46}$Te$_{2.64}$ 是金属。多种合成尝试证实了 Au$_{1.9}$Sb$_{0.46}$Te$_{2.64}$ 有限的稳定化学成分，确定了合成这两种化合物的有效方法，并突出了 AuSbTe 单晶合成面临的挑战。
英文摘要：
Previous studies on natural samples of pampaloite (AuSbTe) revealed the crystal structure of a potentially cleavable and/or exfoliable material, while studies on natural and synthetic montbrayite (Sb-containing Au$_2$Te$_3$) claimed various chemical compositions for this low symmetry compound. Few investigations of synthetic samples have been reported for both materials, leaving much of their chemical, thermal and electronic characteristics unknown. Here, we investigate the stability, electronic properties and synthesis of the gold antimony tellurides AuSbTe and Au$_{1.9}$Sb$_{0.46}$Te$_{2.64}$ (montbrayite). Differential thermal analysis and $\textit{in situ}$ powder x-ray diffraction revealed that AuSbTe is incongruently melting, while Au$_{1.9}$Sb$_{0.46}$Te$_{2.64}$ is congruently melting. Calculations of the band structures and four-point resistivity measurements showed that AuSbTe is a semiconductor and Au$_{1.9}$Sb$_{0.46}$Te$_{2.64}$ a metal. Various synthesis attempts confirmed the limited stable chemical composition of Au$_{1.9}$Sb$_{0.46}$Te$_{2.64}$, identified successful methods to synthesize both compounds, and highlighted the challenges associated with single crystal synthesis of AuSbTe.
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