Effect of silver addition on the microstructures and electrical responses of La(1.7)Sr(0.3)Mo(2)O(9 − δ) ceramics

Different amounts of silver (3–15 wt.% Ag2O) have been mixed with ceramic powders based on La1.7Sr0.3Mo2O9−δ (LSM). XRD analysis indicated that the silver was chemically stable in LSM. TEM observation and XPS analysis showed that some metallic silver atoms presented random distribution in the LSM ceramic, while others entered into crystal lattice in the form of Ag+, efficiently stabilizing the cubic phase at the room temperature. And there were a great enhancement on conductivity in Ag added (<10 wt.% Ag2O) LSM ceramics. Also addition of Ag had a significant influence on the surface oxygen exchange properties with electrode components.

Figure optionsDownload as PowerPoint slideHighlights
► La1.7Sr0.3Mo2O9−δ (LSM) composites with Ag2O were first prepared.
► Both the dipolar effects and motion of ions contribute on the dielectric anomalies.
► Two forms of silver atom coexist in the series of composites.
► Low concentrations of Ag in LSM ceramics led to increase in conductivity.
► Significant influence on the surface oxygen exchange properties in Ag added LSM.