Low-Temperature Predicted Structures of Ag2S (Silver Sulfide)

Abstract

Silver sulfide phases, such as body-centered cubic argentite and monoclinic acanthite, are widely known. Traditionally, acanthite is regarded as the only low-temperature phase of silver sulfide. However, the possible existence of other low-temperature phases of silver sulfide cannot be ruled out. Until now, there have been only a few suggestions about low-temperature Ag2S phases that differ from monoclinic acanthite. The lack of a uniform approach has hampered the prediction of such phases. In this work, the use of such an effective tool as an evolutionary algorithm for the first time made it possible to perform a broad search for the model Ag2S phases of silver sulfide, which are low-temperature with respect to cubic argentite. The possibility of forming Ag2S phases with cubic, tetragonal, orthorhombic, trigonal, monoclinic, and triclinic symmetry is considered. The calculation of the cohesion energy and the formation enthalpy show, for the first time, that the formation of low-symmetry Ag2S phases is energetically most favorable. The elastic stiffness constants cij of all predicted Ag2S phases are computed, and their mechanical stability is determined. The densities of the electronic states of the predicted Ag2S phases are calculated. The prediction of low-temperature Ag2S structures indicates the possibility of synthesizing new silver sulfide phases with improved properties.

Artificial nociceptor using an Ag/Ag2S/Pt atomic switch

“…16 In addition to temperature, an electric field can lead to the α-Ag 2 S to β-Ag 2 S phase transition. 17 The heterostructure of an Ag/Ag 2 S nano-crystal makes it a good candidate for resistive switching-based memory devices with temperature sensitivity due to the reversible process of an α-Ag 2 S to β-Ag 2 S transformation along with a conducting channel formation 18 under an electric field. The Ag/Ag 2 S/Pt structure is well established and well known for atomic switch applications with room temperature quantized conductance and neuromorphic hardware.…”

“…19 In recent works, Ag/Ag 2 S-based flexible memristors have shown excellent endurance (10 5 switching cycles) and retention (10 4 s) proving its suitability for device applications. 20 Ag 2 S is also known for its temperature-dependent conduction modulation 18 and optoelectronic properties. 21 Along with ease of fabrication and good reproducibility, these properties make the Ag/Ag 2 S/Pt atomic switch suitable for bio-inspired electronics.…”

ML-Based Forecasting of Temporal Dynamics in Luminescence Spectra of Ag 2 S Colloidal Quantum Dots

“…• Structure and Morphology: The structure [12] and morphology of Ag 2 S can be modified into nanostructures such as nanoparticles [13], [14] and nanowires [15]. These nanostructures can be integrated into functional nanomaterials to create new properties and possibilities in nanotechnology.…”