The crystal structure of uytenbogaardtite, Ag₃AuS₂, and its relationships with gold and silver sulfides-selenides

Abstract

17The crystal structure of the mineral uytenbogaardtite, a rare silver-gold sulfide, was solved 18 using intensity data collected on a crystal from the type locality, the Comstock lode, Storey This version may be subject to change during the production process.

Colloidal and Deposited Products of the Interaction of Tetrachloroauric Acid with Hydrogen Selenide and Hydrogen Sulfide in Aqueous Solutions

“…Mixed silver-gold sulfides and selenides, including nanoparticulate ones, have attracted intense interest as minerals and natural sources of precious metals [1][2][3][4][5][6][7][8][9][10][11][12][13][14] and due to high ionic conductivity, tunable optical characteristics, thermoelectric and other properties promising for materials applications [15][16][17][18][19]. Gold chalcogenides, in particular gold selenide, are much less examined, despite aqueous Au chalcogenide-derived complexes play the crucial role as carriers of gold in hydrothermal fluids and brines (e.g., [20][21][22][23][24][25] and references therein), and AuSe, Au(Se,S) and Au(Te,Se,S) phases in intergrowths with native gold have been found in the high-sulfidation epithermal deposits formed from acidic fluids [14].…”

BaAu2S2: A Au-Based Intrinsic Photocatalyst for High-Performance Visible-Light Photocatalysis

“…These zigzag chains are further partitioned to each other with Ba 2+ cations locating in the interspaces, which act as the counterions to achieve electrical neutrality. It is worth noting that, although the d 10 element Au has variable coordination numbers (2–4) with chalcogen atoms, which has already led to the discoveries of a variety of complex and interesting chalcogenide structures, − BaAu 2 S 2 is the first Au-based chalcogenide member that adopts such a specific structure type. Besides, from the structural viewpoint, the similarity (e.g., primary covalent bonding) and differences (e.g., structural dimensionality) between BaAu 2 S 2 and its binary prototype Au 2 S can be regarded as a representative example in metal chalcogenides that can perfectly corroborate the dimensional reduction formalism, which describes how an ionic agent A a X reacts with a parent compound MX x to form a child compound A na MX x+n .…”

Gradual Transformation of Ag2S to Au2S Nanoparticles by Sequential Cation Exchange Reactions: Binary, Ternary, and Hybrid Compositions

“…Our previous results showed how cation exchange reactions, in combination with metal heterogeneous nucleation, opened the door for the synthesis of a set of diverse nanocrystals that turned out to show potential as thermoelectric energy conversion materials, as well as contrast agents for Computed Tomography diagnostic techniques, when appropriately functionalized. , In this work we describe the synthesis of the analogous ternary system with sulfur. Compared to the Ag/Au/Se system where only one single ternary material exists that is called fischesserite and shows a Ag 3 AuSe 2 stoichiometry, the S analogue presents two possible stoichiometric compounds, namely, the Ag 3 AuS 2 ( uytenbogaardtite ) and the AgAuS ( petrovskaite ), both previously studied as bulk from compositional, structural, thermodynamic, and electronic perspectives by other authors. − Such structural and stoichiometry diversity represents a new challenge for cation exchange procedures in colloidal systems. Our results show that cation exchange reactions can be successfully performed on Ag 2 S nanocrystals in order to obtain pure Ag 3 AuS 2 and AgAuS nanocrystals decorated with metallic Au.…”