Research of the effective role of silver additions

Influence of Silver Infiltration on the Microstructure and Transport Properties of YbacuO

“…This could be due to the filling of the porosity of the samples, and the presence of silver probably also modifies the grain boundaries leading to an enhanced conductivity [3]. Figure 2 shows some typical electric field/current density curves.…”

Detailed study of the effect of Ag on creep sintering and texturing of YBa2Cu3O7- delta

“…Our results by DTA, analytical STEM and microprobe show that Ag does form a liquid with Cu or CuO and possibly with a smaller amount of BaCuO, at least for concentrations greater than 1%. Deslandes et a1 [26] have shown the existence of a reaction between Ag and Ba compounds above 800°C which results in the decomposition of BaCuO followed by separation of Ag on cooling. We believe that since the quantity of BaCuO is so small (if it exists at all) it is not surprising that we are unable to see any Ba compound separately in the x-ray maps after slow cooling, as we do with the Cu or CuO precipitates; it must be recalled that we are working at the limit of sensitivity of the instrument.…”

“…Several questions arise concerning the composition of this new liquid phase as well as the state of Ag in the final product. In effect it is important to know whether it remains as a pure metal or whether it forms comany parasitic phase [26], and whether it forms a continuous crystalline or amorphous film coating the grains of superconducting material or whether it forms precipitates. A complete microstructural characterization was then performed in order to try and answer these questions as well as those related to texture.…”

Effect of high pressure on the electrical resistivity behaviour of (Pb0.5,Cd0.5)Sr2(Y1-x,Cax)-Cu2O7-δ/Ag2O superconducting composites

“…High-temperature superconducting (HTSC) composites are generally considered as potentially interesting systems for technological applications, mainly because of their large critical current [1,2], lower normal resistivity [2] and better mechanical properties [3][4][5] compared to pure polycrystalline superconductors. Various methods have been employed to prepare superconducting composites, but attention is focused on particulate composites [6][7][8][9], e.g. the addition of Ag 2 O powder to HTSC [10,11].…”