Voltage Fluctuations at Sodium Beta Alumina/Mercury Electrodes.

Abstract

Voltage fluctuations at mercury sodium Beta alumina ceramic electrode interfaces have been investigated. Noise voltages in the absence of current can be explained by Nyquist and interfacial chemical reaction noise. The activation energy of the reaction noise rate constant is determined to be 0.29 eV, which suggests that diffusion of the sodium ions in the electrolyte dominates the reaction. In the presence of a decomposition current, the low frequency noise varies. After current flow, the noise voltage decays and can be observed for some tens of hours. Both current and post current noise signals suggest conductivity fluctuations arising form diffusion of the mobile sodium ions. Fitting experimental data to the diffusion and decay equations yields a diffusion constant of .000008 sq cm per second and a characteristic length equal to the bulk sample length. Keywords: Diffusion noise, Conductivity fluctuations, Superionic conductors, Beta alumina ceramics and single crystals.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1987
Accession Number
ADA182102

Entities

People

  • Chu K. Kuo
  • James J. Brophy

Organizations

  • University of Utah

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Arrhenius Equation
  • Chemical Reactions
  • Chemistry
  • Classification
  • Conductivity
  • Diffusion
  • Electrical Resistance
  • Equations
  • Frequency
  • Governments
  • Mathematics
  • Military Research
  • New Mexico
  • Security
  • Single Crystals
  • United States
  • Universities

Fields of Study

  • Materials science

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  • Battery Technology and Engineering
  • Combustion science or combustion engineering.
  • Materials Science and Engineering.