Accession Number : ADA181128

Title :   Contact Noise in Sodium Beta Alumina.

Descriptive Note : Technical rept. Jan-May 87,

Corporate Author : UTAH UNIV SALT LAKE CITY DEPT OF PHYSICS

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

PDF Url : ADA181128

Report Date : May 1987

Pagination or Media Count : 14

Abstract : Contact noise in sodium beta alumina cels has been studies by voltage fluctuation measurements at frequencies 10,000 to 30,000 Hx in in the presence and absence of current. A propylene carbonate solution of NaI forms a low noise contanct with beta alumina ceramic electrolyte. The noise spectra for aqueous solution of NaNO3, silver amalgam and newly prepared mercury electrodes, however, show excess noise at low frequencies and exhibit f(-2) spectra that suggests nonequilibrium reactions occur at the interface. The current noise of both the aqueous and propylene carbonate solution electrodes displays f/1.5 dependence characteristic of diffusion noise. Keywords: Diffusion; Noise; Conductivity fluctuations; Supersonic; Conductors; Alumina; Ceramics; Crystals.

Descriptors :   *ALUMINUM OXIDES, *CERAMIC MATERIALS, *NOISE, AMALGAMS, CARBONATES, CONDUCTIVITY, CRYSTALS, DIFFUSION, ELECTRODES, ELECTROLYTES, LIQUIDS, LOW FREQUENCY, LOW NOISE, MEASUREMENT, MERCURY, NONEQUILIBRIUM FLOW, PROPENES, SILVER, SODIUM, SOLUTIONS(GENERAL), SPECTRA, VARIATIONS, VOLTAGE

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE