Manufacturing metallic silver from its chalcogenides

Structural and electrical properties of high-energy ball-milled NASICON type Li1.3Ti1.7Al0.3(PO4)2.9(VO4)0.1 ceramics

“…A number of attempts have been reported in literature to increase the conductivity of LATP further, which include various synthesis and sintering techniques [11] and partial substitution of phosphorous in LATP by pentavalent cations like V 5+ , Nb 5+ and Ta 5+ . Gromov et al [12] reported an increase in ion conductivity by vanadium substitution, which was contrary to the results reported by Best et al [12].…”

Thermodynamic Simulation of the Oxidation Processes of Ag₂Se by NaNO₂

“…At elevated temperatures the formation of sodium selenite (Na 2 SeO 3 ) is the most probable, and below 400°C the basic compound is Na 2 SeO 4 . For oxygen is present in the gas-phase, it can be assumed that it is involved in the oxidation process of Na 2 SeO 3 to Na 2 SeO 4 according to the reaction (7). Oxidation of silver with oxygen according to the reaction (8) is thermodynamically impossible, since the change in the Gibbs free energy is positive.…”

“…One of the existing development trends in processing technologies of such products as essentially pure silver selenide (over 85%) is the chemical oxidation which makes selenium pass into water-soluble compounds and silver into metallic state [4,5]. Among the oxidizing agents used to produce metallic silver the sodium nitrite (NaNO 2 ) [6,7] is of great interest, since the chemical and mechanical aspects of its' interactions with silver selenide has not previously been studied. The aim of this study is the thermodynamic simulation of the oxidation of silver selenide by sodium nitrite (NaNO 2 ) and estimation of the effect of sodium hydroxide (NaOH) addition on the reaction products' compositions.…”