Abstract
Conductivity fluctuations and contact noise observed in ceramic and single-crystal silver β″ alumina are very similar to those in sodium β″ alumina. The current-noise spectral density varies as f−3/2, indicative of diffusion noise, is thermally activated with an activation energy of 0.5 eV, significantly smaller than for sodium β″ alumina. In both materials, single-crystal specimens are noisier than the ceramics, and the granular nature of the ceramics does not seem important in the diffusion noise process. The standard expression for diffusion noise is unable to account for either the observed noise magnitude or the temperature dependence.
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