Synthesis of Layered Gold Tellurides AuSbTe and AuTe and Their Semiconducting and Metallic Behavior.

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 AuTe) 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 AuSbTe (montbrayite). Differential thermal analysis and powder X-ray diffraction revealed that AuSbTe is incongruently melting, while AuSbTe is congruently melting. Calculations of the band structures and four-point resistivity measurements showed that AuSbTe is a semiconductor and AuSbTe a metal. Various synthesis attempts confirmed the limited stable chemical composition of AuSbTe, identified successful methods to synthesize both compounds, and highlighted the challenges associated with single-crystal synthesis of AuSbTe.