Accession Number:

ADA170412

Title:

Current Noise in Sodium Beta Alumina Ceramics and Single Crystals.

Descriptive Note:

Technical rept. Sep 85-Aug 86,

Corporate Author:

UTAH UNIV SALT LAKE CITY DEPT OF PHYSICS

Personal Author(s):

Report Date:

1986-08-01

Pagination or Media Count:

17.0

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 -32 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.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE