Accession Number : AD0648958

Title :   THE ELECTRICAL CONDUCTIVITY OF CERAMICS; ITS MEASUREMENT AND INTERPRETATION.

Descriptive Note : Technical rept.,

Corporate Author : SYSTEMS RESEARCH LABS INC DAYTON OHIO

Personal Author(s) : Vest,Robert W.

Report Date : DEC 1966

Pagination or Media Count : 77

Abstract : When an oxide ceramic is placed in an electric field and a current flows in the external circuit, there are three primary questions which must be answered in order to understand and utilize this phenomena. These are (1) what are the charge carriers, (2) what factors govern their concentation, and (3) what factors govern their motion. Experimental techniques which provide answers to these questions are discussed with emphasis on problem areas of particular interest for measurements on ceramics. These problem areas include choice of electrodes, selection of measurement frequency, situ measurements of high impedance samples, effect of sample porosity, and the need for controlled temperature and oxygen partial pressure. Some typical results are presented and discussed in terms of several point defect models. Complementary measurements which, when combined with electrical conductivity, will yield charge carrier mobilities also are discussed. (Author)

Descriptors :   (*CERAMIC MATERIALS, ELECTRICAL CONDUCTIVITY), OXIDES, MEASUREMENT, CRYSTAL DEFECTS, MATHEMATICAL MODELS

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE