Conductivity fluctuations in mixed sodium/cadmium ß″-alumina
Abstract Conductivity fluctuations in mixed sodium/cadmium β″-alumina ceramics for different values of the Na/Ca ratio are observed to be similar to diffusion noise of the mobile ions seen in Na, Ag, and Pbβ′-alumina. Measured noise levels increase two orders of magnitude in changing from 100% Na to 100% Ca ions in the structure. In mixed Na/Ca ceramics the noise is greater for NaI solution current electrodes than the CaBr 2 solution current electrodes. These differences are attributed to different correlation effects between the mobile ions.