Accession Number : ADA195884

Title :   Diffusion Noise in Annealed Na, Ag and Pb Beta Aluminas.

Descriptive Note : Technical rept. Jan-Jun 88,

Corporate Author : UTAH UNIV SALT LAKE CITY DEPT OF PHYSICS

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

PDF Url : ADA195884

Report Date : Jun 1988

Pagination or Media Count : 14

Abstract : Conductivity fluctuations in Lead beta' alumina arising from diffusion of the mobile ions are observed to increase linearly with annealing time at a temperature of 130 C after quenching from 550 C. Simultaneously, the conductivity as measured by Nyquist noise decreases linearly. No effect of annealing on conductivity fluctuations or conductivity is found for either sodium beta' alumina or silver beta' alumina. The increase in conductivity fluctuations for Pb beta' alumina can be interpreted in terms of a decrease in effective ion density for diffusion noise. Keywords: superionic conductors, beta alumina ceramics, electrical conductivity noise (electrical and electromagnetic). (AW).

Descriptors :   *ALUMINUM OXIDES, *CERAMIC MATERIALS, *ELECTRICAL CONDUCTIVITY, *NOISE(ELECTRICAL AND ELECTROMAGNETIC), ANNEALING, DIFFUSION, ION DENSITY, IONS, IONIC CURRENT, MOBILE, NOISE, QUENCHING, SILVER, SODIUM, TIME, VARIATIONS

Subject Categories : Ceramics, Refractories and Glass
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE