Current and thermal noise in mixed Na/Ag bgr;‘alumina

摘要

Current noise in mixed‐ion Na/Ag bgr;‘alumina ceramics is characteristic of conductivity fluctuations due to diffusion noise of the mobile ions as previously observed in Na, Ag, and Pb bgr;‘alumina single‐ion conductors and for mixed‐ion Na/Ca bgr;‘alumina. The measured diffusion noise levels are greater for current injection of Ag ions from AgNO3solution electrodes. Room‐temperature conductivities calculated from thermal noise measurements are the same for both Na and Ag electrodes and show a strong mixed alkali effect. Correlation effects between the mobile ions are the same for both Na and Ag ion injection and are strongest near the 50/50 concentration ratio.