کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
215043 1426219 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Solid state electrochemical and calorimetric study of the equilibrium phase (Cu, Ag)2S
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Solid state electrochemical and calorimetric study of the equilibrium phase (Cu, Ag)2S
چکیده انگلیسی


• Reproducible galvanic cells of different electrolytes were measured accurately.
• ΔfG° values for the solid solution (Cu, Ag)2S and stromeyerite have been determined.
• Ttr/melt along the composition Ag0.92Cu1.08S have been determined by DSC method.
• New enthalpies of phase transitions and melting of (Cu, Ag)2S have been determined.

Thermodynamic stabilities of the solid solution (Cu, Ag)2S in equilibrium with (Cu + S)-compounds have been studied by an EMF method, using the fast Ag+ ion conducting solid electrolytes. In addition to providing data for experimental reproducibility check, the usage of two different electrolytes, in their respective ionic conduction domains, allowed EMF measurements in the (Ag + Cu + S) system over a wide temperature range. For the first time, EMF values for the solid solution (Cu, Ag)2S have been measured above T = 500 K. The EMF measurements were made with the solid state electrochemical cells of the type Pt(−) |Ag| Ag+ ion conductor |(Ag + Cu + S)-phase assemblage | Pt(+), within the temperature range from (383 to 578) K. Phase transition thermodynamic properties of stromeyerite (Ag0.93Cu1.07S) and the solid solution (Cu, Ag)2S have been studied by the differential scanning calorimetry (DSC) technique.Based on the measured E vs. T relations, thermodynamic functions of the Cu-rich solid solution (Cu, Ag)2S have been determined. Accurate thermodynamic properties of the solid solution including data in a new temperature range have been obtained. The results obtained with calorimetric measurements were analyzed and, for the first time, enthalpies of phase transitions and fusion of the solid solution (Cu, Ag)2S have been experimentally determined.

Thermodynamic properties of the superionic solid solution (Cu, Ag)2S and stromeyerite, including ΔfG° values, have been investigated. For the first time, Δtr/meltH° values of the ternary phases have been determined experimentally.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Chemical Thermodynamics - Volume 94, March 2016, Pages 101–109
نویسندگان
, , ,