Current Noise in Sodium Beta Alumina Ceramics and Single Crystals.

Abstract

Conductivity fluctuations and contact noise observed in ceramic and single crystal silver beta double prime alumina are very similar to those in sodium beta double prime alumina. The current noise spectral density varies as f to the -3/2 power, indicative of diffusion noise, and is thermally activated with an activation energy of 0.5 eV, significantly smaller than for sodium beta double prime alumina. In both materials, single crystal specimens are noisier than the ceramics and the granular nature of the ceramics does not seem important in the diffusion noise process. The standard expression for diffusion noise is unable to account for either the observed noise magnitude or the temperature or the temperature dependence.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1986
Accession Number
ADA170412

Entities

People

  • James J. Brophy

Organizations

  • University of Utah

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Reactions
  • Classification
  • Conductivity
  • Contracts
  • Crystals
  • Diffusion
  • Electrodes
  • Energy
  • Experimental Data
  • Frequency
  • Governments
  • Heat Of Activation
  • Materials
  • Military Research
  • Security
  • Single Crystals
  • Universities

Fields of Study

  • Materials science

Readers

  • Acoustics.
  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.