Thermodynamic Properties of AgCl and AgBr

Abstract

Temperatures and enthalpies of fusion as well as the heat capacity of silver chloride and silver bromide were measured by differential scanning calorimetry. A polynomial heat capacity dependence on temperature was used to fit the experimental data. The thermodynamic functions of AgCl and AgBr were calculated by combining these heat capacity results with the entropy at 298.15 K, temperatures, and enthalpies of fusion.

Thermal expansion and heat capacities of AgBr and AgCl at solid and liquid phases from molecular dynamics simulation

“…The molar heat capacities at constant pressure increase linearly with temperature up to about T AgBr 0 ∼ = 500 K (NVE), T AgBr 0 ∼ = 800 K (NPT), T AgCl 0 ∼ = 600 K (NVE) and T AgCl 0 ∼ = 820 K (NPT) as a result of progressive excitation of the 1550091-6Simulation of thermal expansion and heat capacities of AgBr and AgCl harmonic lattice vibrations. In the latest experiment on C P (T ) by Rycerz et al these temperatures were determined as about 500 K for AgBr and 629 K for AgCl showing that our NVE estimations are in accord with those by Rycerz et al17 In the region from T 0 values to the melting temperatures (NPT), the onset of creation of the lattice defects is reflected in the nonlinear rapid increase of C P (T ) with temperature.…”

“…[1][2][3] Due to the potential application of AgBr and AgCl in the areas of electrochemical devices and fuel cells, 4,5 numerous researches have been carried out to investigate the structural, transport, mechanical and thermophysical properties. [6][7][8][9][10][11][12][13][14][15][16][17] The latest experimental measurements of fusion enthalpies and heat capacity of AgBr and AgCl using differential scanning calorimetry have been accomplished by Rycez et al 17 Lack of molecular dynamic study of thermodynamic properties of these compounds has motivated us to investigate the temperature dependence of thermal expansion coefficient (TEC) and molar heat capacities at constant pressure and volume. Here, we present the first molecular dynamics (MD) simulation calculation of these properties of AgBr and AgCl in constant pressuretemperature (NPT) and constant volume-energy (NVE) ensembles at solid and liquid phases.…”

Au‐Ag‐S‐Se‐Cl‐Br Mineralization at the Corrida Deposit (Russia) and Physicochemical Conditions of Ore Formation

“…Calculations G Т for Au-Ag minerals involve the thermodynamic data from [42][43][44]. Thermodynamic properties for Ag chlorides and bromides were taken from [45,46]. Sulphur fugacity (ƒS 2 ) and temperatures of mineral formation were estimated using the electrum-sphalerite geothermometer based on the data on Fe-content of sphalerite (x FeS ) and the amount of Ag (x Ag ) in the coexisting native gold (Au 1−x Ag x ).…”

A review of the photo-thermal mechanism and crystallization of photo-thermo-refractive (PTR) glass

“…However, those particles were shown to not exist at temperatures above this critical temperature. It is important to note that the melting point of macroscopic AgBr crystals is approximately 430 °C [99], but this temperature is lower for nanoparticles [100]. This process was thus associated with the phase change of the silver/silver bromide nuclei (from liquid to solid) that appears during the cooling or heating processes.…”