Current Noise in Sodium Beta Alumina Ceramic.
Abstract
Experimental bulk current noise spectra for NaBeta alumina ceramics are observed over the frequency range f=.003 Hz to 10,000 Hz and with low contact noise, amalgam electrodes. The noise is proportional to the square of the dc current and varies as 1/f times f to the 1/2 power, suggesting bulk conductivity fluctuations arising from diffusion of the conducting ions. The results indicate that individual grains in the ceramic are not stochastically independent and that only a small fraction of the conducting ions present participate in the diffusion process. The number of such ions present participate in the diffusion noise process. The number of such ions is thermally activated with an activation energy of 0.75 eV. Chemical and electrochemical contact noise indicates a reaction at the ceramic-amalgam interface characterized by a reaction rate of 630/sec, even for low-noise contacts.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1983
- Accession Number
- ADA149549
Entities
People
- J. J. Brophy
- Stanley W. Smith
Organizations
- University of Utah