Accession Number : ADA189168

Title :   Contact and Current Noise in Beta Alumina and Nasicon Ceramics.

Descriptive Note : Technical rept. Jun-Nov 87,

Corporate Author : UTAH UNIV SALT LAKE CITY DEPT OF PHYSICS

Personal Author(s) : Kuo, Chu K ; Brophy, James J

PDF Url : ADA189168

Report Date : Nov 1987

Pagination or Media Count : 14

Abstract : Experimental noise spectra of beta alumina and Nasicon ceramics in contact with Sodium Iodide propylene carbonate solution have been investigated. The noise of virgin contacts to both solid electrolytes decays exponentially with time. Low noise contacts can be established in a few hours. The current noise spectra show f- 3/2 and f- 2 dependence in beta alumina and Nasicon, indicating bulk fluctuation arising from diffusion and reactions of the activated ions, respectively. Smaller correlation effects than in sodium beta alumina are observed which may be the result of the lower density of mobile sodium ions in the conducting lattice of both beta alumina and Nasicon. Keywords: Diffusion noise, Conductivity fluctuations; Superionic conductors; Single crystals.

Descriptors :   *ALUMINUM OXIDES, *CERAMIC MATERIALS, *SOLID ELECTROLYTES, *NOISE(ELECTRICAL AND ELECTROMAGNETIC), ACTIVATION, CONDUCTIVITY, DIFFUSION, IONS, SINGLE CRYSTALS, SODIUM, SPECTRA

Subject Categories : Solid State Physics
      Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE