Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
58 (1985), S. 351-354
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Experimental bulk current noise spectra for Na β‘ alumina ceramics are observed over the frequency range f=3×10−3 Hz to 104 Hz and with low contact noise, amalgam electrodes. The noise is proportional to the square of the dc current and varies as f−3/2, 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 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 6.3×102 sec−1, even for low-noise contacts.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.335683
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